Section 9: Magnetic Compass and Log
The compass is a pretty reliable piece of equipment but it is subject to errors arising from the way magnetism works and you need to know about these and how to deal with them.
The log is the device used to measure distance and speed and there are different types with their own particular features.
This section comprises the following:
Magnetic compass errors- variation and deviation
Construction of the marine compass
Steering and handbearing compasses
Log types and operating characteristics