I put it in auto everytime the boat hits the water, its piece of mind for the drain plug, or if there is a livewell hose/pump failure, and if im fishing in the rain and put the boat on the trailer and forget to pull the plug for the drive home the bilge wont fill up with water. Took a little while to remember to hit the switch but now it is second nature, drop boat in water, turn engine on, turn graphs on, hit bilge switch to auto… everytime.