The current mounting for our GPS is to the right of the hatchway on the bulkhead, and it's so far away that it's hard to read and impossible to program from the helm. I want to locate it closer to the helm and rail seat, so the ideal spot will be next to the railing on the coaming. There's enough cable for the routing, but is there an easy way to route the cables through the ceiling material?All I can see to do is to drill the hole and then try to fish the cables after the fact. There has to be a better/more logical way?