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MD69BRX
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11.7 Azimuth Sight Operation (optional accessory)
The MARINE DATA MD69AZI Azimuth Sight (Thomson Pattern) meets the International Standard
ISO 25862:2009 for the testing and certification of Group II Azimuth reading devices.
CAUTION: Always use Sun filters when taking azimuth bearings of the Sun; never
attempt to take bearings of the Sun with unprotected eyes.
11.7.1 Taking Bearings:
Terrestrial Bearings
For taking bearings of landmarks or objects with low luminosity (the arrow on the prism adjustment
thumbwheels = DOWN). A distant object is sighted directly by eye with the compass card being
simultaneously viewed indirectly through the prism. Maximum altitude 34° above the horizon.
Celestial Bearings
For taking bearings of the Sun or other celestial objects (the arrows on the prism adjustment
thumbwheels = UP). The compass card is viewed directly through the collimating lens, with a
distant object being simultaneously viewed indirectly through the reflecting prism. Maximum
altitude 60° above the horizon.