Originally Posted by sailingdog
You can't connect a USB based GPS to an NMEA 0183 device like a Ray55 VHF. NMEA 0183 is based on either a RS-422 or RS-232 serial protocol, with a data rate of 4800 baud, 8 bits, 1 stop bit and No parity. USB is a high speed serial protocol and is not compatible with either RS-422 or RS-232.
I don't have any experience with NMEA, but I do know for a fact (and use professionally) a USB - serial data converter which is not much more than a cable. Some electronics are built into one of the molded connectors. That said, YMMV