Azimuth Marker
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Azimuth Marker
1. A scale encircling the plan position indicator (PPI) scope
of a radar on which the azimuth of a target from the radar may
be measured.
2. Reference limits inserted electronically at 10° or 15°
intervals which extend radially from the relative position of
the radar on an off center PPI scope. These are employed for target
azimuth determination when the radar position is not at the center
of the PPI scope and hence the fixed azimuth scale on the edge
of the scope cannot be employed.
On such markers north is usually 0°, east 90°,
etc. Occasionally, on ship or airborne radars, 0° is used
to indicate the direction in which the craft is heading, in which
cases the relative bearing, not azimuth, of the target is indicated.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
