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Tools Used to Measure Direction
Introduction
The QM uses several pieces of navigational equipment to determine
direction. Remember that direction may be labeled in many ways, such
as course, azimuth angle, bearing... . The following table contains
information about tools and their uses.
Tool
Most often used...
to obtain the bearings of other ships to
determine relative motion
Bearing Circle
also to find the bearing of
any object.
Azimuth Circle
to obtain an azimuth of the Sun for checking
gyrocompass error
also as a bearing circle.
to obtain bearings of aids to navigation to
determine the ship’s position
Telescopic Alidade
also to obtain data for 1amplitudes for
checking gyrocompass error.
to determine and plot bearings and courses on
charts
Parallel Motion
Protractor (PMP)
1
Obtaining an amplitude is a method of checking the error of the gyrocompass. An
amplitude is normally taken of the Sun rising or falling, but it may be used for any celestial
body.
2-22
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