This device automatically adjusts your trim tabs via a built-in GPS system + 3 gyroscopes + 3 accelerometers depending on the sea conditions. Three working modes: 1) Drive in harbour: it prevents or minimizes the movement of flaps. 2) Gliding: it lowers the tabs while gliding and then retracts them when the boat has reached its trim. 3) Navigation: it automatically adjusts the flaps depending on the rolling and pitching angles, keeping the boat in its best trim according to sea conditions. It can also save 2 manually-set trims. Version A: supplied with GPS receiver/antenna and NMEA 2000 Network. Version B: supplied without receiver/antenna and NMEA 2000 Network. It can be connected to an existing GPS antenna and NMEA 2000 network.