Battery Combining, Use Electronics

Over the weekend we received a query that should be shared with everyone. Here is John's question: "Hi Ed, Alden Trull put me on to your web site, very helpful fellow.I am re-wiring two boats at present, my own 42ft cruising ketch and a Farr 37 racing boat. Both have split battery systems for motor start and ship and I have a nav station on the other side to the present batteries (VHF, HF, Radar, Chratplotter & GPS)and I am considering a dedicated coms battery near to the stations to reduce ...