Abstract: A device and method for protecting D.C. powered electronic equipment to be isolated from a D.C. marine power source for minimizing the interference of extraneous signals on the power signals along with a back-up D.C. power source for powering the electronic equipment in the event of the loss of operative power signals from the D.C. source. The device may include a remote indicator for signalling the marine vessel operator that the electronic equipment is being powered from the back-up power source and not the main power source.

Abstract: A mount for a tubular supporting rail of a marine vessel for securing an antenna to the mount by means of an antenna ferrule. The mount includes clamping elements adapted to be secured to the supporting rail and carrying a threaded securing post, one clamping element has a cylindrical end to rotatably mount an L-shaped hollow rotary member that is mounted to the cylindrical end of the one clamping element and is rotatably positioned thereto. The L-shaped member includes an outwardly extending mounting post for securing objects thereto and thereby the supporting rail.