I just finnished replacing my C80 with an E80 on my upper helm
and an E80 on my lower helm. The reason I installed an E80, was to gain the ability to have two chart plotters at two different stearing station on my 42' Trawler
Some of the connections on the E80 are different then a C80. The radar
connection is the same, the power connection is the same, but the Seatalk
cable is different. The three pronged crescent Seatalk
cable that is on the C80 is not present on the E80.
You have to connect the GPS
with the Seatalk/alarm out cable. Remember to power the GPS
and the Seatalk cable with 12V. All properly fused of course.
If you aren't planning to network two chart plotters there is not much sense in replacing the C80 with the E80.
The two chart plotters are then connected with an HS cable