Volvo Penta D13 Series Operator's Manual page 51

Optional
CAUTION!
The boat will continue to move in the selected direction
even when the joystick has been released.
To slow the boat or reverse its direction, move the
joystick in the opposite direction. In order to achieve a
diagonal movement, move the joystick diagonally and
use the joystick knob to adjust the boat's direction
accordingly.
The docking function is designed to be used when
docking or maneuvering in close quarters. Use the
steering wheel and throttle control levers in all other
situations.
The boat is maneuvered by moving the joystick
forward, aft, abeam, twisting the top of the joystick and
combinations of the movements.
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