I'll have to take the cover off the box to get that pix. There is not much to it. Most of the wire's are not used.
The GPS interface's with the VHF [2 wires] and then interface's with the Navman 3100 [don't remember how many wire's, I think it was 2]
All the other wire's are just tucked back. I don't have the Furuno 582 interfaced with the GPS. I don't see the need for it and it just add's redundant clutter to the FF screen.
Yes it would add depth and temp to a waypoint entry.
So what?