[ARC5] A.R.C., "ARC-5", "ARC-12" and "ARC-type-12"

[gordon white]

The AN/ARN-30 is the military version of an "Omni" nav system. I recall 
using a commercial Omni receiver when I was flying, back in the 1960s. 
The omni gave a 360 degree "to" or "from" indication on a cockpit dial. 
This was a great advantage over the Adcock or four-course radio range it 
was replacing. The Adcock, if you ever heard/saw old flying movies, had 
the pilot "on the beam," which led to or from the station. On one side 
of the beam you heard an "A" in your headsets, on the other an "N"   In 
the center you heard a steady tone, interrupted occasionally by the 
Morse identifier.

  - Gordon White
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