Mike Brewer posted a discussion
ICOM 504 or 604 Compatability
I have the E120 & 80 along with the AIS650. I also have the Raymarine 218 VHF. The radio has never worked correctly as it always looses data and fellow boaters tell me my radio fades, but my ICOM 504 works great. Is the 604 compatible with my system? See More