My 7.8m has a C80 / DSM 300 Sounder with transome mopunt / Wifi Lifetag system, 2kw RADAR, (AIS is been fitted this week) and interfaced with NMEA to Suzuki 300 and to Raymarine 240E DSC VHF. I also have a Gecko intercom system PTT integrated.
My back up is Garmin Handheld on bike mount / Simrad RD 68
Backup for this handbearing compas and handheld
Anyway to the point - the Rig is awsome and not over the top as I do x channel, Belgium, holland etc if anyone would like to come have a look at the installation poke around ask questions fiddle with the knobs buttons your more than welcome. Also happy to try and answer any tech questions on the Raymarine stuff.