A magnetic compass is located in an oblong box on top of the main housing. The
magnetic compass needle can be seen through a window or through the magnifier.
Zero azimuth heading with respect to magnetic north or any other selected
compass treading can be made by turning the orienting knobs or the azimuth knob.
Elevation angle of the telescope is adjusted by turning the elevation knob.
Azimuth and elevation angles up to 85 roils can be read from the horizontal and
vertical centerline on the reticle while looking through the elbow telescope,
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