What causes variation in a compass?

Which type of daymark is used to mark the port side of the channel when entering...

A magnetic compass card is marked in how many degrees?

The heading of a vessel is indicated by what part of the compass?

What does the lubber's line on a magnetic compass indicate?

A vessel heading NNW is on a course of __________.

A vessel heading NE is on which course?

A vessel heading WSW is on a course of __________.

A vessel heading SSE is on a course of __________.

Apparent wind speed blowing across a MODU under tow can be measured by a(n) ____...

At 0000 you fix your position and change course to 090°T. At 0030 you again fix...