Bluetooth-enabled heading sensor contains a compass that detects your boat's heading and communicates it to your trolling motor to enable the Spot-Lock Jog feature, which lets you move your Spot-Lock location in 5' increments in any direction. This heading sensor comes standard with Ultrex, Ulterra, Terrova, Riptide Ulterra and Riptide Terrova trolling motors that come pre-installed with Bluetooth i-Pilot and i-Pilot Link systems.