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Chapter 2
Compasses
Introduction
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.
Objectives
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.
Topic
Page
The Magnetic Compass
2-2
Earth’s Magnetic Field and Magnetism
2-3
Compass components, types and operation
2-7
Magnetic Compass Error
2-9
The Shipboard Degaussing System
2-12
Magnetic Compass Record Book
2-18
Magnetic Compass Adjustment
2-19
The Gyrocompass
2-20
Tools Used to Determine and Plot Direction
2-22
Gyrocompass Error
2-23
Determine Gyro Error
2-32
2-1
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