Context
The transceiver plug must be firmly connected to the side socket on the Transceiver Unit - and the transducer must be submerged
in water - before you can start transmitting (‘pinging’) with the SU90 system.
CautionYou must never permit the SU90 system to transmit (ping) when the ship is in dry dock. The transducer may be damaged if it transmits in open air.