The ARN-501 TACAN  is designed to operate in conjunction with a land or ship based beacon. The system will provide continuous indications of bearing and slant range distance to the beacon as well as its Morse Code identification signal. The TACAN system requires deviation compensated magnetic bearing information which is automatically combined with the TACAN bearing and displays the aircraft's relative position in relation to the beacon. Aural beacon identification is transmitted every 37.5 seconds.

AN/ARN-501 components. (Extract from a Sea King training manual)

This diagram shows the location of the ARN-501 components in and on the airframe. Click to enlarge. (Extract from a Sea King training manual)

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Credits and References:

1)  Ian Snow  RCAF/CF retired.<va3qt-4(at)sympatico.ca>
2) Extract from Sea King Training Manual

Jume 27/10