Radio-Magnetic Compass Indicator

Technical Information

Catalogue No: C0169
Category: Navigation/Inertial
Object Type: Indicator/Instrument
Object Name: Radio-Magnetic Compass Indicator
Part No: 36145-1AM30B1
Serial No: 406103
Manufacturer: Bendix
Division: Eclipse-Pioneer [of Bendix]
Year of Manufacture:
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Location: Archive Object Store

26 Volts 400 Cycles
Radio-Magnetic Compass
Manufactured under one or
more of the following patents
2,550,663 2,627,245
Type No 36146-1AM30B1
Serial No 406103
The Bendix Corporation Eclipse-Pioneer Division
Teterboro New


An automatic direction finder (ADF) is an aircraft radio-navigation instrument that automatically and continuously displays the relative bearing from the aircraft to a suitable radio station. A Radio-magnetic Compass Indicator provides more information than a standard ADF. While the ADF shows relative angle of the transmitter with respect to the aircraft, an A Radio-magnetic Compass Indicator display incorporates a compass card, actuated by the aircraft's compass system, and permits the operator to read the magnetic bearing to or from the transmitting station, without resorting to arithmetic.

The instrument incorporates two direction needles; One needle (the thicker, double-barred needle) is connected to an ADF and the other (generally thin or single-barred) is connected to a VOR. Using multiple indicators, a navigator can accurately fix the position of their aircraft using triangulation, without requiring the aircraft to pass over the top of the station.
Like most instruments offered by Elliott Bros in the 60’s this was manufactured under a Licence from Bendix.

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