Navi 1_2
Nautical Navigation Quiz
Test your knowledge of nautical navigation with our expertly crafted quiz! Dive into essential navigation concepts, from estimated positions to tidal datums, and enhance your maritime expertise.
Whether you're a student or an experienced navigator, this quiz covers:
- Navigation techniques
- Tidal measurements
- Geodesy principles
- Set and drift calculations
31. What is an estimated position (EP)?
A DR position corrected for leeway, steering error, and current.
A position obtained from GPS only.
A position obtained from a visual fix.
A position obtained from a single line of position.
32. What is set and drift?
The direction and speed of the wind.
The direction and speed of the current.
The direction and speed of the vessel.
The direction and speed of the tide.
33. Which factors can cause the DR position to diverge from the vessel’s actual position?
Wind, current, tide, and waves.
Visibility, current, leeway, and waves.
Leeway, steering error, current, and tide.
Steering error, tide, wind, and waves.
34. What is leeway?
The windward motion of a vessel due to the wind perpendicular to the vessel's track.
The lateral motion of a vessel due to the wind parallel to the vessel's track.
The longitudinal motion of a vessel due to the wind parallel to the vessel's track.
The leeward motion of a vessel due to the wind perpendicular to the vessel's track.
35. How can set and drift be applied to the DR to obtain an estimated position?
By calculating the vector sum of set and drift and applying it to the DR.
By subtracting the vector sum of set and drift from the DR.
By calculating the magnitude of set and drift and applying it to the DR.
By ignoring set and drift and relying on the DR alone.
36. What is the definition of mean higher high water (MHHW)?
The average level of the high waters that occur at the time of spring tides.
The average height of all high waters over a 19 year period.
The average height of the higher high waters of each tidal day.
The average height of the higher high waters that occur when the moon is near maximum declination.
37. What is the set in navigation terminology?
The distance in miles between the DR and the fix.
The time elapsed since the last reset of the DR.
The direction from the DR to the fix.
The speed of the vessel through the water.
38. What is the drift in navigation terminology?
The direction from the DR to the fix.
The time elapsed since the last reset of the DR.
The speed of the vessel through the water.
The distance in miles between the DR and the fix.
39. What is the navigator comparing when determining the set and drift?
Simultaneous fix and DR positions.
The current and leeway of the vessel.
The vessel's speed and course over time.
The position of the vessel at the start and end of a voyage.
40. How is an estimated position (EP) calculated?
Take a fix at a known location and plot it on the chart.
Draw a vector from the DR position in the direction of the set, with the length equal to the product of the drift and the number of hours since the last reset.
Use a GPS receiver to determine the vessel's position.
Use dead reckoning without any corrections to determine the vessel's position.
41. What is the estimated track made good?
The direction of a straight line from the DR to the EP
The direction of a straight line from the last fix to the DR
The direction of a straight line from the last fix to the EP
The direction of a straight line from the EP to the DR
42. What is the estimated speed made good?
The length of the line from the DR to the EP divided by the time between the fix and the EP
The length of the line from the last fix to the DR divided by the time between the fix and the EP
The length of the line from the EP to the DR divided by the time between the fix and the EP
The length of the line from the last fix to the EP divided by the time between the fix and the EP
43. How is the EP calculated?
Draw a vector from the DR position in the direction of the set, with the length equal to the product of the drift and the number of hours since the last reset.
Draw a vector from the fix position in the direction of the set, with the length equal to the product of the drift and the number of hours since the last reset.
Draw a vector from the DR position in the direction of the drift, with the length equal to the product of the set and the number of hours since the last reset.
Draw a vector from the fix position in the direction of the drift, with the length equal to the product of the set and the number of hours since the last reset.
44. When should the prudent navigator calculate set and drift?
Only when there are changes of course or speed since the last fix
At every fix
Only when there are no dynamic forces acting on the vessel
Only when there is steering error
45. Which high water datum is likely to be the highest?
Mean high water (MHW)
Mean higher high water (MHHW)
Mean high water springs (MHWS)
Tropic higher high water (TcHHW)
46. What is geodesy?
The study of marine life.
The study of rocks and minerals.
The study of weather patterns.
The science concerned with the exact positioning of points on the surface of the earth.
47. Why were the factors studied in geodesy unimportant to early navigators?
Because their methods were relatively inaccurate.
Because they did not have access to the necessary equipment.
Because they only traveled short distances.
Because they relied on celestial navigation.
48. What is the geoid?
A type of rock found on the ocean floor.
A surface along which gravity is always equal and to which the direction of gravity is always perpendicular.
A measurement of ocean currents and salinity changes.
A mathematical equation used to model the earth's shape.
49. Why is the direction of gravity significant in geodetic measurements?
The direction of gravity affects ocean currents.
The direction of gravity affects the earth's rotation.
Optical instruments containing level devices are commonly used, and the vertical axis of the instrument coincides with the direction of gravity.
The direction of gravity has no impact on geodetic measurements.
50. What is the ideal ocean surface?
A surface that is perfectly flat.
A surface that is always in motion.
A surface that is always in motion.
A surface that is free of ocean currents and salinity changes.
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