Operator controls mounted on the autopilot control unit and on the NT921BTI allow simple adjustment in each steering mode available for selection via the Bowthruster CONTROL MODE SELECTOR switch as follows: THRUSTER OFF for autopilot control of rudder only MANUAL for power steer via thruster(s) only using NT921BTI MANUAL control AUTOTHRUST for autopilot control of thruster(s) only AUTOTHRUST + RUDDER for autopilot control of rudder and thruster(s) The NT921BTI control panel also provides LED status indicators and displays (LCD) bow error and thruster response level. Designed as a matching module for internal (bridge or wheelhouse) location adjacent to the autopilot control unit, the NT921BTI is suitable for bracket or panel mounting.