LRTs, LATs, Coastal Transponders and TZ/OBC Transponders are commanded using a transponder deck unit. The system comprises a deck unit and dunking transducer supplied with 10 metres of cable.

The unit is used initially to program the acoustic identity of the transponder, test the transponder and, in the case of the Lightweight Release Transponder, load the release ‘bit’ prior to deployment. Once deployed, it can be used to measure ranges to the transponder and prior to sending a secure release command, relocate the transponder. The deck unit can also be controlled via RS232 enabling raw range data to be logged to a PC.