A. Direct-reading card
B. Direct-reading needle
C. Indirect-reading card
D. Indirect-reading needle

2.The primary reason a diving compass is liquid-filled is to:

A. Prevent pressure differential problems
B. Dampen needle movement
C. Prevent fogging of the cover
D. Prevent leakage

3.To obtain a reciprocal heading, add _ degrees to a compass heading.

A. 90
B. 120
C. 180
D. 360

4.The greatest factor affecting the accuracy of underwater compass navigation is:

A. The type of compass used
B. The length of the lubber line
C. How the compass is held
D. The underwater visibility

 5. When navigating a triangular (equilateral) course, your turns must be( ) degrees if you want to return to the starting point.

A. 60
B. 120
C. 180
D. 210

6. Which of the following effects is of the greatest concern to a diving navigator?

A. Deviation
B. Variation
C. Declination
D. Inclination
E. All are of equal concern

7. To prevent compass error, you must keep all metal objects a minimum of ( ) inches from the instrument.

A. 6
B. 12
C. 18
D. 36

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