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The ladder

T · V · M · D · C

Going down the ladder (true toward compass) subtract easterly and add westerly. Going up (compass toward true) add easterly and subtract westerly. "East is least, west is best" names the compass side.

Skill 1 · Compass conversionsProblem 9003

A magnetic course of 255°M is wanted. What do you steer by the steering compass?

A magnetic course of 255°M is wanted. What do you steer by the steering compass?

Give whole degrees (000 to 359). This one must be exact.

Given
Magnetic course255°M
Deviation on this heading1°W
°C
New problem

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