While cruising or racing into the wind, the tack assist feature can help you determine if your boat is being lifted or headed. When you calibrate tack assist, the device captures your boat's port and starboard course over ground (COG) measurements, and uses the COG data to calculate the mean true wind direction and the boat's tack angle .
The device uses this data to determine whether your boat is being lifted or headed due wind shifts.
By default, the device tack assist is set to automatic, and the device recalculates the tack angle and true wind direction each time the port or starboard COG is calibrated. You can change the tack assist settings to enter a fixed tack angle or true wind direction.