The compass is the best known and most widely used of all navigational
instruments. It would be almost impossible to obtain precise
information on headings and directions without the compass.
There are two types of compasses in use. The gyrocompass is the
compass that is used the most aboard ship. The magnetic compass is
used as a backup because it requires no electricity to operate. This
chapter will explain the operation and use of each type of compass and
its related equipment.
The material in this chapter will enable the student to:
Describe the components of the magnetic and gyroscopic compasses.
Identify and correct for compass errors.
Explain the procedure used to determine magnetic compass error.
Record entries in the Magnetic Compass Record Book.
Describe the process of swinging ship, conducting compass
sensibility tests, and filling out the compass deviation card.
Determine gyrocompass error.
The Magnetic Compass
Earths Magnetic Field and Magnetism
Compass components, types and operation
Magnetic Compass Error
The Shipboard Degaussing System
Magnetic Compass Record Book
Magnetic Compass Adjustment
Tools Used to Determine and Plot Direction
Determine Gyro Error