Upgrade from C80 to C95

Okay, I know this can't be that difficult, but we are getting many different answers.

I have an e127 and my buddy saw it and wanted to upgrade his C80.

So, the decision has been made by him to go with a C95. Great, that's all set.

The Problem:

The C 80 has 3 connections that are being used.

1 - Power Plug. This is self explanatory...Got it

2 - GPS / Antenna three wire sort of flat plug. NOT going to use the external GPS, so just tie it back and do not use it. Done...

3 - Round 5 pin connector hooked into the NEMA In/Out port. This is for very limited Smart Craft transfer as best a I can tell. Depth, speed, course direction.

How do we interface this with the new c95?

Thanks,
Dave