I decided to put electronics on my Avon Searider 4m, and since it's usually a pretty wet ride I wanted the entire system to be self contained and waterproof. I didn't really find any plans on the internet, so I thought to post my setup here in case anyone is looking for ideas.
The VHF and the GPS units power/data cables are individually connected to the pelican battery box with waterproof 6-pin connectors. It's wired so that the VHF pulls/sends DSC info from/to the GPS.
I spent $167.92 total on the battery box. In addition I purchased these two units:
VHF: ICOM IC-M412 Class D (waterproof IPX 6 rating) -- $199.99
GPS: Raymarine A70d (waterproof IPX 7 rating) -- $899.99
If you want more info you can email me at firstname.lastname@example.org