Seamanship_Secrets_185_Tips_-_Techniques_for_Better_Navigation-_Cruise_Planning-_and_Boat_Handling_Under_Power_or_Sail_(Re)_e..

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64 seamanship secrets


Hold the micrometer drum and spin it one way or the other to perfectly align three things
at once: the index-arm mark, the zero-degree mark on the arc, and the zero-minutes mark
on the micrometer drum.


Turn the micrometer drum away from you about a quarter turn. You’ll notice the minutes
increase. When adjusting or checking for error, this is called on the arc. Subtract the
minutes to correct an observation.

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