Navi1
1. What is Dead Reckoning?
The process of determining one's present position by using a compass.
The process of determining one's present position by observing celestial bodies.
The process of determining one's present position by using electronic positioning information.
The process of determining one's present position by projecting course(s) and speed(s) from a known past position.
2. Why is the DR position only an approximate position?
Because it does not take into account the position of celestial bodies.
Because it does not take into account the position of other ships.
Because it does not allow for the effect of leeway, current, helmsman error, or compass error.
Because it does not take into account the position of landmarks.
3. What are some of the uses of Dead Reckoning?
Predicting the weather, determining the ship's speed, and evaluating the crew's performance
Determining sunrise and sunset, predicting landfall, sighting lights, and predicting arrival times
Determining the ship's heading, calculating fuel consumption, and maintaining radio communication.
Observing celestial bodies, navigating through ice, and detecting underwater hazards.
4. What is the most important use of Dead Reckoning?
Determining the ship's speed and direction.
Observing celestial bodies for navigation.
Calculating fuel consumption.
Projecting the position of the ship into the immediate future and avoiding hazards to navigation.
5. What is a fix?
A position determined by projecting course(s) and speed(s) from a known past position.
A position determined by projecting course(s) and speed(s) from a known present position.
A position determined by a navigator using observations of celestial bodies or electronic positioning systems.
A position determined by dead reckoning.
6. Why is it important to update the DR plot when required?
To ensure the accuracy of the projected course and speed.
To avoid potential navigational hazards.
To make sure the navigator is aware of any hazards to navigation.
To maintain the safety of the ship
7. What can a fix taken at each DR position reveal?
The position of landmarks.
The effects of current, wind, and steering error.
The position of other ships.
The effects of compass error.
8. What is the purpose of using DR when an Electronic Charts Display and Information System (ECDIS) is the primary plotting method?
To provide a backup in case the ECDIS fails.
To improve the accuracy of the projected position.
To reduce the workload of the navigator.
To provide a more reliable method of navigation.
9. Why is the use of a traditional DR plot on paper charts a prudent backup in restricted waters?
Because celestial navigation may not be possible.
Because the accuracy of electronic positioning information may be compromised.
Because other ships may interfere with electronic positioning systems.
Because the use of ECDIS is not allowed in restricted waters
10. What is the definition of tropic higher high water (TcHHW)?
The average height of all high waters over a 19 year period.
The average level of the high waters that occur at the time of spring tides.
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.
11. What is the purpose of maintaining the DR plot directly on the chart?
To make course and speed changes without consulting the chart.
To confuse the navigator and captain.
To evaluate a vessel's future position in relation to charted navigation hazards.
To make it harder to plan operational commitments.
12. How far ahead should you maintain the DR if transiting in the open ocean?
One hour ahead of the last fix position.
Four hours ahead of the last fix position.
Two hours ahead of the last fix position.
Three hours ahead of the last fix position.
13. What tools can you use to transfer course lines to and from the compass rose?
Pencils, erasers, or markers.
Protractors, rulers, or compasses.
Scissors, glue, or tape.
Parallel rulers, rolling rulers, or triangles.
14. What type of chart usually contains instructions for measuring direction?
Mercator chart.
Conformal chart.
Compass rose.
Gnomonic chart.
15. What directions are on the outside of the compass rose?
Magnetic directions.
No directions.
True directions.
Both true and magnetic directions.
16. What is the latitude scale used for when measuring distances on the chart?
To measure the latitude of the vessel.
To assume that one minute of latitude equals one nautical mile.
To measure distances on small scale charts.
To measure distances on large scale charts.
17. How should you measure direction on a conformal chart?
At the meridian closest to the area of the chart in use.
Using a transparent plastic navigation plotter.
At any convenient place on the chart.
Using the latitude scale.
18. What type of chart projection has nonparallel meridians?
Conformal chart.
Mercator chart.
Gnomonic chart.
Compass rose.
19. What is the recommended direction to use for most purposes when using a compass rose?
True directions.
Magnetic directions.
Both true and magnetic directions.
No directions.
20. How should you measure long distances on small-scale charts?
Use the distance scale provided on the chart.
Break the distance into a number of segments and measure each segment at its mid-latitude.
Use the latitude scale closest to the area of interest.
Measure the entire distance on the latitude scale.
21. When should you plot the vessel's DR position?
After every change of course or speed.
After plotting a single line of position.
After every fix or running fix.
At least every hour on the hour.
22. What is taking departure?
Changing course back to the original heading.
Plotting a DR position after every course and speed change.
Plotting a single line of position.
Obtaining a last visual fix before leaving a harbor.
23. How should you measure courses on a chart?
Measure direction on a conformal chart having nonparallel meridians.
Use magnetic directions on the compass rose.
Use the chart's compass rose nearest to the chart area currently in use.
Measure distances using the chart's longitude scale.
24. How often should you maintain the DR plot while transiting in the open ocean?
Every hour on the hour.
After plotting a single line of position.
After every fix or running fix.
At least four hours ahead of the last fix position.
25. What is the purpose of maintaining the DR plot directly on the chart?
To measure distances using the chart's latitude scale.
To evaluate a vessel's future position in relation to charted navigation hazards.
To use magnetic directions on the compass rose.
To measure direction on a conformal chart having nonparallel meridians.
26. When should the DR plot be reset?
After every fix or running fix
Every hour on the hour
Only if the navigator hasn't taken a fix for an extended period of time
Every time the course or speed changes
27. What should a navigator consider when determining whether to reset the DR to the inertial estimated position?
Availability of GPS signal
Time since the last fix and availability of fix information
Visibility conditions
Wind direction and speed
28. In what situation might a navigator reset the DR to an inertial estimated position?
When a surface ship is experiencing electronic equipment failure
When a submarine is operating in shallow water
When fix information is readily available
When fix information will soon be available, but operational considerations call for a more accurate assessment of the vessel's position.
29. Why might a navigator reset the DR to an inertial EP?
To save time
To avoid time-dependent errors
To avoid having to take a fix
To obtain a more accurate assessment of the navigation situation
30. What is the primary factor a navigator should consider when deciding whether to wait for the next fix or reset the DR to an inertial estimated position?
Dynamics of the navigation situation
Reliability and accuracy of the fix source
Time since the last fix and availability of fix information
Distance from the vessel to the nearest port.
{"name":"Navi1", "url":"https://www.quiz-maker.com/QQB2XB2SC","txt":"1. What is Dead Reckoning?, 2. Why is the DR position only an approximate position?, 3. What are some of the uses of Dead Reckoning?","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}
