Note the "Hell" machine in the foreground which converts 5-unit tape to morse. The Sagem telex is behind it. ITT Mackay-Marine receivers for 500khz and HF working can be seen at the bottom of the console. Above this are remote control panels for Codan receivers at Shoal Bay receiving station. Frequencies monitored are 2182, 4125, 6215, 8291, 12290 and 16420khz (A3J). The operator could switch between local and remote receivers to compare signals.