It is in Home-Settings-Fish Finder-User Settings, Fish Finder Transmit also, but less button pushes to turn on from fish finder display. Also, if the fish finder is not being used for finding fish, it really isn't intended to be used to provide navigational depth and temp because fish finders are designed to be used in deeper than 15 feet of water. A NMEA2000 smart depth and temp transducer would be the way to go, and it doesn't have a way transmit on/off setting.