Open Bridge

TRR Tactical Range Recorder

OKA Data Computer *

QGB Sonar Stack **

AP Attack Plotter

* Calculates and records the horizontal range of a sonar target

**Transmitter, Receiver, Indicating Range Recorder, Bearing Deviation Indicator, and Transducer

Note: Information on Sonar Hut equipment provided by Bob Ellis, SO2 (1949-1952)