He could rebuild this. He would set the receive frequencies to the marine band, set the transmit to match, disable the emergency self-targeting, and enable a simple channel scan. The fishing trawler didn't need MDC1200. They just needed to talk to the other boats.
You can adjust the high/low transmit power settings to ensure the radio stays within legal limits or extends the life of the PA module. Scan Lists: motorola gm950 programming software top
Marco disconnected the cable. He attached a test antenna, a speaker-mic, and a 12V power supply. He tuned a second radio to 156.800 MHz. He pressed PTT on the GM950. He could rebuild this