You can't use the OBS; you use Automatic Direction Finder for NDBs.
2.
Two distinguishing external features of the UC-43 are the circular automatic direction finder R-985 engine.
3.
The pilot instead relied on visual reference, using the copilot's automatic direction finder ( ADF ).
4.
The second advance was the introduction of the automatic direction finder ( ADF ), which completely automated the RDF procedure.
5.
The traditional, VOR and Automatic Direction Finder ( ADF ), ground based en route system has an availability rate of 98.5 %.
6.
An automatic direction finder, often capable of being tuned to commercial AM radio transmitters, is a feature of almost all modern aircraft.
7.
Operation consists solely of tuning in the station, and is so automatic that these systems are normally referred to as automatic direction finder.
8.
An NDB navigational aid operates by transmitting a continuous three-letter identification code which is picked up by the airborne receiver, the Automatic Direction Finder ( ADF ).
9.
Other navigation tools include distance measuring equipment ( DME ), an automatic direction finder ( ADF ), a Northrop Grumman inertial navigation system and a Trimble GPS system.
10.
Due to incorrect automatic direction finder ( ADF ) readings caused by the thunderstorm, the plane strayed 15 km ( 9.3 mi ) west from the procedural let-down track.
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