A marine Furuno radio preprogrammed with all marine frequencies was around in the 1980’s. A friend of mine who had been a radio operator told me that there was something in the circuitry that he could alter that made the transmitter fully tuneable to all the ham frequencies. As I recall the receiver side was tuneable without the mode. It was a high quality unit. A lot of yachties went to Sat-C with a cheap laptop, the address closely held as it was not cheap.