Tidal Stream Compensation - Raymarine autopilot control unit Owner's Handbook Manual

20 ST7001+ Autopilot Control Unit - Owner's Handbook
Cross track error (XTE)
more than 0.3 nm
Waypoint 2
Waypoint 1

Tidal stream compensation

Under most conditions, the autopilot will hold the selected track to
within ±0.05 nm (300 ft) or better. The autopilot takes account of the
boat's speed when computing course changes to ensure optimum
performance over a wide range of boat speeds.
Waypoint 2
Boat's speed over ground
Waypoint 1
D3261-2