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Preview Navigational Procedures Questions
You are on course 355°T and take a relative bearing of a lighthouse of 275°. What is the true bearing of the lighthouse? | 085° | 270° | 280° | 080° |
You are on course 222°T and take a relative bearing of a lighthouse of 025°. What is the true bearing to the lighthouse? | 247° | 315° | 197° | 335° |
You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse? | 227° | 177° | 363° | 003° |
You are on course 344°T and take a relative bearing of a lighthouse of 270°.
What is the true bearing to the lighthouse? |
074° |
090° |
254° |
016° |
You are on course 180°T and take a relative bearing of a lighthouse of 225°. What is the true bearing of the lighthouse? | 270° | 045° | 180° | 135° |
You take a bearing of 264° of a lighthouse. What bearing of another object
would give the best fix? |
081° |
350° |
120° |
289° |
You take a bearing of 086° of a lighthouse. What bearing of another object would give the best fix? | 000° | 066° | 112° | 271° |
You take a bearing of 176° of a lighthouse. Which bearing of another object would give the best fix? | 079° | 151° | 176° | 292° |
You take a bearing of 176° of a lighthouse. What bearing of another object would give the best fix? | 000° | 021° | 189° | 272° |
You take a bearing of 356° of a lighthouse. What bearing of another object would give the best fix? | 201° | 013° | 082° | 176° |
You take a bearing of 356° of a lighthouse. Which bearing of another object would give the best fix? | 178° | 256°
|
342° | 013° |
You take a bearing of 313° and 076° of two objects. Which bearing of a third object will give the best fix? | 014° | 133° | 339° | 255° |
You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix? | 022° | 131° | 211° | 249° |
You take a bearing of 086° of a lighthouse. Which bearing of another object would give the best fix? | 261° | 291° | 242° | 196° |
You take a bearing of 264° of a lighthouse. Which bearing of another object
would give the best fix? |
239° |
059° |
291° |
182° |
You take a bearing of 191° and 313° to two objects. Which bearing of a third object will give the best fix? | 001° | 069° | 209° | 356° |
You take a bearing of 142° and 259° of two objects. Which bearing of a third object will give the best fix? | 234° | 201° | 081° | 238° |
You take a bearing of 142° and 259° of two objects. What bearing of a third object will give the best fix? | 084° | 281° | 019° | 166° |
You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix? | 201°
|
356° | 144° | 102° |
You take a bearing of 043° and 169° of two objects. What bearing of a third object will give the best fix? | 309° | 073° | 356° | 192° |
You take bearings of 313°T and 076°T on two objects. Which bearing of a third object will give the best fix? | 048°T | 101°T | 142°T | 187°T |
A position on the Earth has a longitude of 74°10'E. Its celestial counterpart
would have a __________. |
GHA
of 285°50' |
SHA
of 285°50' |
LHA
of 74°10'E |
SHA of 74°10' |
Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN? | C 356°T, Sp 5 knots | C 192°T, Sp 23 knots | C 278°T, Sp 6 knots | C 099°T, Sp 17 knots |
Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN ? | C 101°T, Sp 7 knots | C 349°T, Sp 25 knots | C 018°T, Sp 6 knots | C 079°T, Sp 24 knots |
Given are the courses and speeds of 4 vessels. The navigator of which vessel would be required to know the actual time of meridian transit in order to take an accurate observation at LAN? | C 095°T, Sp 30 knots | C 268°T, Sp 22 knots | C 162°T, Sp 27 knots | C 356°T, Sp 5.5 knots |
Given are the courses and speeds of 4 vessels. The navigator of which vessel
would be required to know the actual time of meridian transit in order to
take an accurate observation at LAN? |
C
112°T, Sp 4 knots |
C
291°T, Sp 25 knots |
C
166°T, Sp 24 knots |
C 013°T, Sp 7 knots |
The altitude at LAN may be observed by starting several minutes in advance and continuing until a maximum altitude occurs. This procedure should not be used __________. | on a fast vessel on northerly or southerly headings | if the vessel is stopped or making bare steerageway | when the declination and latitude are of different names | when the declination is greater than and the same name as the latitude |
In order for a star to be used for a sight at lower transit, the star must __________. | have a declination equal to or greater than your latitude | have the SHA equal to or less than the LHA | have a GHA of 180° | be circumpolar |
A body can only be observed at lower transit when __________. | the body is circumpolar | the algebraic sum of the colatitude and declination exceeds 90° | the declination is the opposite name to the latitude | the observer is in high latitudes above either polar circle |
When taking stars, those bodies to the east and west will __________. | change altitude rapidly | remain in an almost fixed position | change altitude slowly | appear to be moving in the plane of the horizon |
When taking an amplitude, the Sun's center should be observed on the visible horizon when __________. | the declination is of a different name from the latitude | the Sun is near or at a solstice | in high latitudes | the Sun's declination is at or near 0° |
An amplitude of the Sun in high latitudes __________. | should only be observed when the Sun's lower limb is above the horizon | is most accurate before sunrise | is most accurate after sunset | is most accurate when the Sun's center is observed on the visible horizon |
What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'? | 30°30'E | 120°30'W | 149°30'E | 59°30'W |
What is the geographic longitude of a body whose GHA is 232°27'? | 61°52'E | 61°52'W | 52°27'E | 127°33'E |
What is the geographic longitude of a body whose GHA is 215°15'? | 35°15'E | 35°15'W | 144°45'E | 144°45'W |
The line of position determined from a sight with an observed altitude (Ho) of 88°45.0' should be __________. | plotted by using an intercept from an assumed position | plotted as an arc around the GP of the body | calculated as a longitude line | reduced to the meridian and plotted as a latitude line |
When plotting a circle of equal altitude for a high altitude sight, the radius of the circle is determined by the formula __________. | 180° - GHA | z - d | 90° - Ho | GHA - LHA |
The line of position should be plotted as a circle around the GP of the body when the Ho exceeds what minimum value? | 80° | 83° | 85° | 87° |
The GP of a body for a high altitude sight is determined from the declination and the __________. | Greenwich hour angle | zenith distance | azimuth | right ascension |
The center of a circle of equal altitude, plotted on the surface of the Earth, is the __________. | geographical position of the body | assumed position of the body | assumed position of the observer | dead reckoning position of the observer |
The GP of a body for a high altitude sight is determined from the declination and the __________. | sidereal hour angle | observed altitude | Greenwich hour angle | right ascension |
The GP of a body for a high altitude sight is determined from the Greenwich hour angle and the __________. | zenith distance | declination | azimuth angle | circle of equal altitude |
What is the major problem with taking high altitude sun observations? | The tables are not as accurate due to inherent errors in the spherical triangle at high altitudes. | Rapidly changing altitudes make it difficult to get an accurate altitude. | Possible errors due to unusual refraction may exist. | It is difficult to establish the point where the sextant is vertical to the horizon. |
What is the major advantage of high altitude observations? | The semidiameter correction of the sextant altitude is eliminated. | Errors due to unusual parallax are eliminated. | The same body can be used for a fix from observations separated by several minutes. | The declination is the only information needed from the almanac. |
Why are low altitude sun sights not generally used? | Modern sight reduction tables are not complete for low altitudes below 5°. | The glare on the horizon causes irradiation errors. | Errors due to unusual refraction may exist. | Sextants may have large errors at small angles of elevation. |
In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________. | using a dip correction based on the height of eye above the ice | doubling the semidiameter correction | using a dip correction from table 22 in Bowditch Vol. II | adding 30° of arc to the sight |
At morning stars, the first stars that should be observed are those with an azimuth in which quadrant? | Western | Eastern | Northern | Southern |
At morning stars, the last stars that should be observed are those with an azimuth in which quadrant? | Western | Eastern | Northern | Southern |
At evening stars, the first stars that should be observed are those with an azimuth in what quadrant? | Western
|
Northern | Eastern
|
Southern |
At evening stars, the last stars that should be observed are those with an azimuth in what quadrant? | Northern | Eastern | Western | Southern |
In general, the most effective period for observing stars and planets occurs during the darker limit of __________. | astronomical twilight | nautical twilight | civil twilight | sunset |
A dead reckoning (DR) plot __________. |
must be plotted using magnetic courses | ignores the effect of surface currents | is most useful when in sight of land | may be started at an assumed position |
A dead reckoning (DR) plot __________. |
should
be replotted hourly |
should
be started each time the vessel's position is fixed |
must
utilize magnetic courses |
must take set and drift into account |
Discounting slip, if your vessel is turning RPM for 10 knots and making good a speed of 10 knots, the current could be __________. | with you at 10 knots | with you at 2 knots | against you at 10 knots | slack |
A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good __________. | at high vessel speeds | at low vessel speeds | in deep water | in shallow water |
The type of current which will have the greatest effect on the course made good for your vessel is __________. | one that flows at nearly right angles to your course steered | a rotary current in which the direction of current flow constantly changes | one flowing in the same direction as your course steered | one flowing in the opposite direction as your course steered |
You are heading in a northerly direction when you come across an easterly current. Your vessel will __________. | be pushed to port | decrease in engine speed | remain on course | be pushed to starboard |
At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE? | You must increase speed to compensate for the current. | The current cannot be determined. | The current is westerly at 0.5 knot. | The drift is 0.25 knot. |
At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile west of your DR. Which statement is TRUE? | The set is 090°, drift 0.5 knot. | The set is 270°, drift 1.0 knot. | The set is 270°, drift 0.5 knot. | The set is 270°, drift 0.25 knot. |
At 0000 you fix your position and change course to 090°T. At 0030 you again fix your position and it is 0.5 mile east of your DR. Which statement is TRUE? | The current is easterly. | You should alter course to the right to regain the track line. | The current is perpendicular to your track line. | The drift is 0.5 knot. |
At 0000 you fix your position and change course to 270°T. At 0030 you again fix your position, and it is 0.5 mile east of your DR. Which statement is TRUE? | The set is 270°, drift 1.0 knot. | The set is 090°, drift 0.5 knot. | The set is 270°, drift 0.5 knot. | The set is 090°, drift 1.0 knot. |
Which statement concerning current is TRUE? | Current can be determined by measuring the direction and distance between simultaneous EP and DR positions. | The distance between a simultaneous DR position and fix is equal to the drift of the current. | The drift of the current should be averaged out on a one hour basis. | After the current is determined, it should not be used for further plotting because it is an unknown variable. |
Which error is NOT included in the term "current" when used in relation to a fix? | Poor steering | Leeway | Ocean currents | Known compass error |
You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r) __________. | are being affected by a southerly current | must come right to get on the range | course is in error | compass has some easterly error |
You are steering a southerly course, and you note that the chart predicts an easterly current. Without considering wind, how may you allow for the set? | Decrease your speed | Increase your speed | Head your vessel slightly to the right | Head your vessel slightly to the left |
Your vessel is making way through the water at a speed of 12 knots. Your vessel traveled 30 nautical miles in 2 hours 20 minutes. What current are you experiencing? | A following current of 0.9 knot | A following current at 2.0 knots | A head current of 2.0 knots | A head current of 0.9 knot |
When possible, a DR plot should always be started from where? | A known position | An assumed position | Any position | None of the above |
The direction in which a vessel is steered is the course. The path actually followed is the __________. | route | course over the ground | heading | track |
The paths of intended travel between three or more points is the __________. | bearing | track | course | course over the ground |
The direction in which a vessel should be steered between two points is the __________. | course | bearing | course over the ground | heading |
The direction a vessel is pointed at any given time is the __________. | heading | course | track | course over the ground |
The path that a vessel is expected to follow, represented on a chart by
a line drawn from the point of departure to the point of arrival, is the
__________. |
estimated
course |
DR
plot |
heading |
track line |
The difference between the DR position and a fix, both of which have the same time, is caused by __________. | deviation | current | leeway | variation |
You plot a fix using three lines of position and find they intersect in a triangle. You should plot the position of the vessel __________. | in the geometric center of the triangle | outside of the triangle | on the line of position from the nearest object, between the other two lines of position | anywhere in the triangle |
In illustration D051NG below, why was the position labeled "E" plotted? | the vessel's position was fixed at 1145 | the position is a running fix | a dead reckoning position is plotted for each speed change | a dead reckoning position is plotted within a half-hour of each course change |
In illustration D051NG below what is indicated by the position labeled "C"? | estimated position | fix | running fix | dead reckoning position |
You are navigating in pilotage waters using running fixes. The maximum time between fixes should be about __________. | 5 minutes | 1 hour | 30 minutes | 4 hours |
How many fixed objects are needed to plot a running fix? | None | One | Two | Three |
In illustration D051NG below, why was the position labeled "C" plotted? | running fixes are better estimates of true position than dead-reckoning positions | the vessel's speed changed | the vessel's course changed form due North to due East | All of the above. |
You should plot your dead reckoning position __________. |
only
in pilotage waters |
from
every fix or running fix |
every
three minutes in pilotage waters |
from every estimated position |
You should plot a dead reckoning position after every __________. | fix or running fix | course change | speed change | All of the above. |
In illustration D051NG below, why was the position labeled "D" plotted? | the vessel's speed changed at 1125 | a dead reckoning position is plotted within 30 minutes of a running fix | a dead reckoning position is plotted for each course change | All of the above. |
A position obtained by applying ONLY your vessel's course and speed to a known position is a __________. | dead-reckoning position | running fix | fix | probable position |
Your dead reckoning position should be plotted __________. | when coming on or going off soundings | at least every hour on the hour in the open waters of the sea | whenever an estimated position is plotted | when it agrees with your GPS position |
You plot a fix using three lines of position and find they intersect in a triangle. The actual position of the vessel __________. | may be inside or outside of the triangle | is outside of the triangle | is the geometric center of the triangle | may be anywhere in the triangle |
You are plotting a running fix in an area where there is a determinable current. How should this current be treated in determining the position? | The set should be applied to the second bearing. | The current should be ignored. | The course and speed made good should be determined and used to advance the LOP. | The drift should be added to the ship's speed. |
Which statement about an estimated position is TRUE? | It is more reliable than a fix based on radar bearings. | When a 3-LOP fix plots in a triangle, the center of the triangle is the estimated position. | It may be based on a single LOP or questionable data. | It is usually based on soundings. |
A position that is obtained by using two or more intersecting lines of position taken at nearly the same time, is a(n) __________. | running fix | dead-reckoning position | fix | estimated position |
You are taking bearings on two known objects ashore. The BEST fix is obtained when the angle between the lines of position is __________. | 45° | 30° | 60° | 90° |
Which position includes the effects of wind and current? | Leeway position | Set position | Dead reckoning position | Estimated position |
A position that is obtained by applying estimated current and wind to your vessel's course and speed is a(n) __________. | fix | dead reckoning position | estimated position | None of the above |
Which position includes the effects of wind and current? |
Set
position |
Estimated
position |
Leeway
position |
Dead reckoning position |
You are running parallel to the coast and estimate that the current is against you. In plotting a running fix using bearings from the same object on the coast, the greatest safety margin from inshore dangers will result if what speed is used to determine the fix? | Maximum speed estimate | Average speed estimate | Minimum speed estimate | A running fix should not be used under these conditions. |
You are running parallel to the coast and take a running fix using bearings of the same object. If you are making less speed than used for the running fix, in relation to the position indicated by the fix, you will be __________. | closer to the coast | farther from the coast | on the track line behind the fix | on the track line ahead of the fix |
You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be __________. | on the track line behind the fix | on the track line ahead of the fix | farther from the coast | closer to the coast |
A navigator fixing a vessel's position by radar __________. | can use radar information from one object to fix the position | should never use radar bearings | should only use radar bearings when the range exceeds the distance to the horizon | must use information from targets forward of the beam |
When using a radar in an unstabilized mode, fixes are determined most easily from __________. | center bearings | tangent bearings | ranges | objects that are close aboard |
You are plotting a running fix. The LOP to be run forward is an arc from a radar range, what technique should be used? | The distance between LOP's should be added to the radar range and a new arc swung. | The position of the object observed should be advanced to the new time and a new arc swung using the radius of the old arc. | The arc should be converted into a straight line using offsets and then run forward. | An arc should never be run forward. |
A chart position enclosed by a square is a(n) __________. | dead reckoning position | running fix | estimated position | fix |
A chart position enclosed by a semi-circle is a(n) __________. | fix | running fix | estimated position | dead reckoning position |
What describes an accurate position that is NOT based on any prior position? | Dead-reckoning position | Fix | Estimated position | Running fix |
You determine your vessel's position by taking a range and bearing to a buoy. Your position will be plotted as a(n) __________. | dead-reckoning position | running fix | estimated position | fix |
A single line of position combined with a dead-reckoning position results
in a(n) __________. |
fix | assumed position | running fix | estimated position |
A position obtained by taking lines of position from one object at different times and advancing them to a common time is a(n) __________. | estimated position | running fix | fix | dead-reckoning position |
A vessel's position should be plotted using bearings of __________. | fixed objects | fixed known objects on shore | buoys close at hand | All of the above. |
Lines of position may be __________. | hyperbolas | arcs | straight lines | All of the above. |
A line connecting all possible positions of your vessel at any given time is a __________. | fix | longitude line | line of position | latitude line |
A line of position is __________. | not used in a running fix | a line connecting two charted objects | the position of your vessel | a line on some point of which the vessel may be presumed to be located |
A line of position formed by sighting two charted objects in line is called a(n) __________. | estimated position | relative bearing | track line | range line |
A line of position derived by radar range from an identified point on a coast will be a(n) __________. | parabola | arc | line parallel to the coast | straight line |
A radar range to a small, charted object such as a light will provide a line of position in which form? | Arc | Hyperbola | Parabola | Straight line |
A true bearing of a charted object, when plotted on a chart, will establish a __________. | line of position | range | relative bearing | fix |
What is NOT an advantage of the rhumb line track over a great circle track? | Easily plotted on a Mercator chart | Plots as a straight line on Lambert conformal charts | Negligible increase in distance on east-west courses near the equator | Does not require constant course changes |
What is the major advantage of a rhumb line track? | The rhumb line is the shortest distance between the arrival and departure points. | The vessel can steam on a constant heading (disregarding wind, current, etc.). | It is easily plotted on a gnomonic chart for comparison with a great circle course. | It approximates a great circle on east-west courses in high latitudes. |
When is the rhumb line distance the same as the great circle distance? | The rhumb line distance is always longer than the great circle distance. | Course 090°T in high latitudes | Course 045°T in low latitudes | Course 180°T when you cross the equator |
In which voyage, between two points, is the rhumb line distance NOT approximately the same as the great circle distance? | The two points are in high latitudes in the same hemisphere. | The two points are in low latitudes in the same hemisphere. | One point is near the equator, one point is in a high latitude, and both are near the 180th meridian. | The two points are near the equator, but in different hemispheres. |
What is a characteristic of a rhumb line? | The course angle constantly changes to form the loxodromic curve. | It plots as a straight line on a Lambert conformal chart. | It cuts each meridian at the same angle. | It is the shortest distance between two points on the Earth. |
A great circle track provides the maximum saving in distance on __________. | easterly courses in high latitudes | southerly courses in high latitudes | westerly courses in low latitudes | easterly courses in low latitudes that cross the equator |
Except for N-S courses, and E-W courses on the equator, a great circle track between two points, when compared to a rhumb line track between the same two points, will __________. | be nearer to the pole in the Northern Hemisphere and nearer to the equator in the Southern Hemisphere | always be nearer to the equator | always be nearer to the elevated pole | be nearer to the pole or the equator depending on the latitudes of the arrival and departure positions |
The shortest distance between any two points on earth defines a __________. | rhumb line | small circle | great circle | hyperbola |
What defines a great circle? | The smallest circle that can be drawn on the face of a sphere | A curved line drawn on a Mercator Chart | A course line that inscribes a loxodromic curve | The intersection of a plane passing through the center of a sphere. |
The latitude of the upper vertex of a great circle is 36°N. What is the latitude of the lower vertex? | 36°S | Cannot be determined from the information given | 0° | 36°N |
A great circle crosses the equator at 141°E. It will also cross the equator at what other longitude? | 141°W | 41°E | 39°W | 180°E |
A great circle crosses the equator at 162°E. It will also cross the equator at what other longitude? | 62°E | 18°W | 126°W | 162°W |
A great circle crosses the equator at 134°E. It will also cross the equator at what other longitude? | 46°W | 34°E | 134°W | 124°W |
A great circle crosses the equator at 173°E. It will also cross the equator at what other longitude? | 173°W | 73°E | 73°W | 7°W |
A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude? | 127°E | 27°W | 53°E | 27°E |
A great circle crosses the equator at 93°W. It will also cross the equator at what other longitude? | 177°W | 87°E | 13°E | 177°E |
A great circle crosses the equator at 17°W. It will also cross the equator at what other longitude? | 17°E | 173°W | 163°E | 117°W |
A great circle crosses the equator at 157°W. It will also cross the equator at what other longitude? | 57°E | 23°E
|
57°W | 157°E |
A great circle will intersect the equator at how many degrees of longitude apart? | 0° | 90° | 45° | 180° |
The distance that a vessel travels from the time that the order to put engines full astern until the vessel is dead in the water is known as __________. | head reach | advance | surge | transfer |
The vertex of a great circle track is in LONG 109°E. An eastbound vessel would cross the equator in LONG __________. | 19°E | 161°W | 161°E | 19°W |
The upper vertex of a great circle track is in LONG 156°00'E. Sailing eastward, the great circle track will cross the equator in LONG __________. | 66°00'E | 114°00'W | 66°00'W | 110°00'W |
The distance in longitude from the intersection of a great circle and the equator to the lower vertex is how many degrees of longitude? | 135° | 180° | 90° | 45° |
The longitude of the upper vertex of a great circle track is 169°E. What is the longitude of the lower vertex? | 169°W | 076°E | 011°W | 101°W |
From LAT 07°12'N, LONG 80°00'W, to LAT 47°12'S, LONG 169°18'E, the initial great circle course angle is 137.25°. How would you name this course? | S 137.25°E | N 137.25°W | S 137.25°W | N 137.25°E |
The initial great circle course angle between LAT 23°0034°00'S, LONG 18°00'E is 063.8°. What is the true course? | 063.8°T | 243.8°T | 116.2°T | 296.2°T |
For navigational purposes, each great circle on the Earth has a length of __________. | 3,600 miles | 21,600 miles | 12,500 miles | 5,400 miles |
Your vessel has changed course and is heading 285°T, you are on the charted
range and it appears as in illustration D048NG below. After several minutes
the range appears as in illustration D047NG below and your heading is still
285°T. What does this indicate? |
course made good to the left of the DR track | leeway caused by a NE'ly wind | south-setting current | north-setting current |
You are on course 355°T and take a relative bearing of a lighthouse of 275°. What is the true bearing of the lighthouse? | 085° | 280° | 270° | 080° |
You are on course 222°T and take a relative bearing of a lighthouse of 025°. What is the true bearing to the lighthouse? | 247° | 315° | 197° | 335° |
You are on course 357°T and take a relative bearing of a lighthouse of 180°. What is the true bearing to the lighthouse? | 227° | 363° | 003° | 177° |
You are on course 344°T and take a relative bearing of a lighthouse of 270°. What is the true bearing to the lighthouse? | 090° | 074° | 254° | 016° |
You are on course 344°T and take a relative bearing of a lighthouse of 090°. What is the true bearing to the lighthouse? | 016° | 074° | 254° | 270° |
You are on course 277°T and take a relative bearing of a lighthouse of 045°. What is the true bearing to the lighthouse? | 038° | 232° | 315° | 322° |
A nautical mile is a distance of approximately how much greater than or less than a statute mile? | 1/4 greater | 1/4 less | 1/7 less | 1/7 greater |
A nautical mile is a distance of approximately how much greater than or less than a statute mile? | 1/7 greater | 1/7 less | 1/4 less | 1/4 greater |
You are outbound in a channel marked by a range astern. The range line is 309°T. You are steering 127°T and have the range in sight as shown in illustration D047NG below. What action should you take? | Come left until the range comes in line then alter course to 125°T. | Come right to 129°T. | Come right to close the range then when on the range steer 129°T. | Come left until the range comes in line then alter course to 129°T. |
You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illustration D048NG below. Which action should you take? | Immediately alter course to 309°T if the range is closing. | Continue on the present heading until the range is in line then alter course to the right. | Immediately alter course to the left to bring the range in line. | Immediately alter course to the right to bring the range in line. |
You are inbound in a channel marked by a range. The range line is 040°T. You are steering 036°T. The range is in sight as shown in illustration D047NG below, and is closing. Which action should you take? | Immediately alter course to 040°T. | Continue on the present heading until the range is in line then alter course to the left. | Immediately alter course to the right to bring the range in line. | Continue on course until the range is closed, then alter course to the right. |
You are inbound in a channel marked by a range. The range line is 216°T. You are steering 213°T and have the range in sight as shown in illustration D048NG below. Which action should you take? | Immediately alter course to the right to bring the range in line. | Immediately alter course to the left to bring the range in line. | Continue on the present heading until the range is in line then alter course to the right. | Immediately alter course to 216°T if the range is closing. |
You are outbound in a channel marked by a range astern. The range line is 273°T. You are steering 090°T and have the range in sight as shown in illustration D047NG below. What action should you take? | Come right to 093° T. | Come right to close the range then when on the range steer 093° T. | Come left until the range comes in line then alter course to 087° T. | Come left until the range comes in line than alter course to 093° T. |
You are inbound in a channel marked by a range. The range line is 133°T. You are steering 129°T and have the range in sight as shown in illustration D048NG below. Which action should you take? | Immediately alter course to the left to bring the range in line. | Immediately alter course to 133°T if the range is closing. | Continue on the present heading until the range is in line then alter course to the right. | Immediately alter course to the right to bring the range in line. |
You are outbound in a channel marked by a range astern. The range line is 133°T. You are steering 315°T and have the range in sight as shown in illustration D048NG below. What action should you take? | Come right until the range comes in line then alter course to 317°T. | Come left to 313°T. | Come right until the range comes in line then alter course to 313°T. | Come left to close the range then when on the range steer 313°T. |
You are entering port and have been instructed to anchor, as your berth is not yet available. You are on a SW'ly heading, preparing to drop anchor, when you observe the range lights as shown in illustration D047NG below, on your starboard beam. What action should you take? | ensure your ship will NOT block the channel or obstruct the range while at anchor | drop the anchor immediately as a change in the position of the range lights will be an indication of dragging anchor | drop the anchor immediately as the range lights mark an area free of obstructions | NOT drop the anchor until the lights are in line |
What is the relative bearing of an object broad on the port beam? | 235° | 315° | 270° | 300° |
Your vessel is entering port when you change course and steady up on a range with the lights in line. After a few minutes you observe the range lights as shown in illustration D047NG below. How should your heading be altered? | right, and when the range lights are in line again, steer to keep them dead ahead | right, and when the range lights are in line again, steer to keep them in line fine on the port bow | left, and when the range lights are in line again, resume your original heading | left, and when the range lights are in line again, steer to keep them in line fine on the starboard bow |
Your vessel is entering port and you have steadied up on a range, dead ahead, in line with your keel. After a few minutes the range, still dead ahead, appears as shown in illustration D047NG below. Which action should you take? | Alter heading to the left | Alter heading to the right | Maintain heading, keeping the range dead ahead | Increase speed |
You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illustration D047NG below. The range continues to open. What action should you take? | Alter course to the left to close the range, then alter course to 309°T. | Alter course to the left until the range closes, then steer to the left of 306°T. | Alter course to the right to 309°T or more to bring the range in line. | Maintain course as it is normal for the range to open as you get close. |
What is the relative bearing of an object broad on the port bow? | 315° | 330° | 345° | 360° |
You are on course 180°T and take a relative bearing of a lighthouse of 225°.
What is the true bearing of the lighthouse? |
270° |
180° |
045° |
135° |
What is the relative bearing of an object broad on the starboard quarter? | 045° | 090° | 135° | 225° |
You are on course 027°T and take a relative bearing to a lighthouse of 220°. What is the true bearing to the lighthouse? | 113° | 193° | 247° | 279° |
A relative bearing is always measured from __________. | the vessel's beam | true north | the vessel's head | magnetic north |
What is the relative bearing of an object dead astern? | 270° | 000° | 090° | 180° |
What is the relative bearing of an object sighted dead ahead? |
180° | 090° | 015° | 000° |
What is the relative bearing of an object broad on the starboard bow? | 030° | 045° | 060° | 075° |
What is the relative bearing of an object broad on the starboard beam? | 090° | 045° | 060° | 075° |
What is the relative bearing of an object broad on the starboard quarter? | 090° | 105° | 135° | 150° |
What is the relative bearing of an object broad on the port quarter? | 195° | 225° | 240° | 265° |
What is the relative bearing of an object on the port beam? | 045° | 090° | 180° | 270° |
You are on course 030°T. The relative bearing of a lighthouse is 45°. What is the true bearing? | 015° | 075°
|
345° | 255° |
You are underway in an area where the charted depth is 8 fathoms. You compute the height of tide to be -4.0 feet. The draft of your vessel is 5.0 feet (1.52 meters). You determine the depth of the water beneath your keel to be __________. | 39 feet (11.9 meters) | 57 feet (17.4 meters) | 43 feet (13.1 meters) | 47 feet (14.3 meters) |
You are underway in a vessel with a draft of 7.0 feet (2.1 meters). The charted depth for your position is 9 fathoms. You compute the height of tide to be +3.0 feet (0.9 meters). You determine the depth of the water beneath your keel to be __________. | 50 feet (15.3 meters) | 41 feet (12.6 meters) | 32 feet (9.8 meters) | 64 feet (19.6 meters) |
You are underway in a vessel with a draft of 6.0 feet. You are in an area where the charted depth of the water is 4 fathoms. You would expect the depth of water beneath your keel to be approximately __________. | 24 feet | 30 feet | 12 feet | 18 feet |
If a chart indicates the depth of water to be 6 fathoms and your draft is 6.0 feet, what is the depth of the water under your keel? (Assume the actual depth and charted depth to be the same) | 6.0 feet | 26.5 feet | 30.0 feet | 56.5 feet |
When using horizontal sextant angles of three objects to fix your position, an indeterminate position will result in which situation? | The vessel is outside of a triangle formed by the objects. | The objects lie in a straight line. | The vessel is inside of a triangle formed by the objects. | A circle will pass through your position and the three objects. |
When making landfall at night, the light from a powerful lighthouse may sometimes be seen before the lantern breaks the horizon. This light is called the __________. | diffusion | elevation | loom | backscatter |
When making landfall at night, you can determine if a light is a major light or an offshore buoy by __________. | the intensity of the light | the color, because the buoy will have only a red or a green light | checking the period and characteristics against the Light List | All of the above. |
If several navigational lights are visible at the same time, each one may be positively identified by checking all of the following EXCEPT what against the Light List? | Rhythm | Color | Period | Intensity |
When using a buoy as an aid to navigation which of the following should
be considered? |
The
buoy should be considered to be in the charted position if it has been freshly
painted. |
The
buoy should be considered to always be in the charted position. |
If
the light is flashing the buoy should be considered to be in the charted
location. |
The buoy may not be in the charted position. |
When using a buoy as an aid to navigation which of the following should
be considered? |
The
buoy may not be in the charted position. |
If
the light is flashing, the buoy should be considered to be in the charted
location. |
The
buoy should be considered to be in the charted position if it has been freshly
painted. |
The buoy should be considered to always be in the charted location. |
When should a navigator rely on the position of floating aids to navigation? | During daylight only | Only when inside a harbor | During calm weather only | Only when fixed aids are not available |
When navigating a vessel, you __________. | can always rely on a buoy to show proper light characteristics | should assume a wreck buoy is directly over the wreck | should never rely on a floating aid to maintain its exact position | can always rely on a buoy to be on station |
When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________. | wait until the lights are no longer in a vertical line | continue on the present course | come right | come left |
When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should __________. | come left | come right | wait until the lights are no longer in a vertical line | continue on the present course |
When you are steering on a pair of range lights and find the upper light is above the lower light you should __________. | come left | wait until the lights are no longer in a vertical line | continue on the present course | come right |
When you are steering on a pair of range lights and find the upper light is above the lower light you should __________. | come left | wait until the lights are no longer in a vertical line | come right | continue on the present course |
You are on course 226°T. In order to check the latitude of your vessel, you should observe a celestial body on which bearing? | 270° | 026° | 000° | 226° |
You are on course 312°T. To check the speed of your vessel you should observe a celestial body on which bearing? | 090° | 222° | 312° | 000° |
You are on course 238°T. To check the course of your vessel you should observe a celestial body on which bearing? | 328° | 090° | 180° | 238° |
You are on course 303°T. To check the speed of your vessel you should observe a celestial body on which bearing? | 090° | 000° | 213° | 123° |
You are on course 209°T. In order to check the longitude of your vessel, you should observe a celestial body on which bearing? | 299° | 209° | 000° | 270° |
A line of position from a celestial observation is a segment of a __________. | parallel of declination | parallel of altitude | circle of equal altitude | vertical circle |
You are on course 042°T. To check the course of your vessel you should observe a celestial body on which bearing? | 090° | 132° | 180° | 222° |
You are on course 146°T. To check the speed of your vessel you should observe a celestial body on which bearing? | 000° | 056° | 090° | 146° |
You are on course 201°T. To check the speed of your vessel you should observe a celestial body on which bearing? | 180° | 111° | 201° | 090° |
You are on course 061°T. To check the longitude of your vessel you should observe a celestial body on which bearing? | 061° | 180° | 241° | 090° |
A latitude line will be obtained by observing a body __________. |
on
the prime vertical |
on
the celestial horizon |
at
lower transit |
on
the Greenwich meridian |
While steering a course of 150°T, you wish to observe a body for a latitude check. What would the azimuth have to be? | 090°T | 150°T | 000°T | 240°T |
While steering a course of 150°T, you wish to observe the Sun for a speed check. What would the azimuth have to be? | 090°T | 150°T | 060°T | 240°T |
A star is observed at lower transit. The line of position derived from this sight is __________. | of no special significance | on the prime vertical | a longitude line | a latitude line |
You are on course 138°T. To check the latitude of your vessel you should observe a celestial body on which bearing? | 138° | 270° | 000° | 318° |