Most countries' amateur radio licences allow licensed operators to install and use radio transmission equipment while at sea. Such operation is known as maritime mobile amateur radio. In most cases the operator's call sign needs to be extended by adding the suffix "/MM" when transmitting at sea.
... in the past, and even more so than a normal home-based amateur radio "shack" ... receivers, electronic automatic steering, domestic radio and perhaps television receivers as well as probably radar and VHF transmitters and receivers too ... compact, three-dimensional space and that space is shared by not only the radio operator, but perhaps several other crew or family members ...
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