The most common battery switch on boats under roughly 60’ is the (4) position switch, denoted OFF, 1, 2, and 1+2.

“A ship in harbor is safe, but that’s not what ships are built for.” John A. Shedd, 1928

CHIRP technology, CHIRP being an an acronym for Compressed High Intensity Radiated Pulse, has been around since the 1950’s...

This is a question that I am often asked when the time comes to replace the batteries on a boat.