# Marine Navigation: Compass Deviation Calculation Quiz

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## 28 Questions

It increases.

Directional

Magnetostriction

### What may cause false echoes in an echo sounder?

Bioluminescent microorganisms in the water

### Which phenomenon involves the axis of an object wobbling when torque is applied?

Torque‐induced precession

Rapid error

### What position is obtained by applying estimated current and wind to your vessel's course and speed?

Estimated position

### Which reading is equivalent to a barometric pressure of 29.92 inches of mercury?

1013.25 millibars

### What is the purpose of correcting apparent altitude in celestial navigation?

Inaccuracies in the reading and reference level

### Where can mariners find information on the direction and velocity of rotary tidal currents?

Tidal Current Tables

### What is the speed of sound in water?

1.1 kilometers per second

18 kHz

760

### When a vessel's course is slowly changing to the right at night with the gyro-pilot engaged, what action should be taken FIRST?

Switch to hand steering.

### What is the Arctic Circle's latitude in relation to the Tropic of Cancer?

44 degrees 06' North

Gyropilot

6,076 feet

### What is the interval called between the sun's upper limb being on the horizon and its center being 12 degrees below?

Astronomical twilight

3° W

### What do isogonic lines on a chart indicate?

Points of equal variation

### What does the revision of a chart indicate?

Part of the title

### On which area of a Mercator chart is the revision information typically printed?

Cylindrical projection

### In the IALA Buoyage System, what color combination represents an East Cardinal Mark?

Black band above yellow band

### When relieving the helm, what should the new helmsman be knowledgeable about?

Course per magnetic steering compass

### Which action should be taken if a crew member falls overboard off the port side?

Immediately put the engine astern

Diffraction

### Which physical check is NOT part of verifying gyro, azimuth circle, and pelorus on a ship?

Align the compass north to the fore and aft line of the ship

Test your knowledge on calculating compass deviation for marine navigation based on vessel's heading, variation, and gyro error. Choose the correct deviation amount among the options provided for different scenarios.

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