Volvo Penta IPS Operator's Manual page 66

In Case of Emergency
64
Steering the boat
Put the control levers in forward. Use a suitable engine
speed for maneuvring.
The direction of the steering is determined by the use
of the control levers. If the boat is to turn to starboard,
reduce speed on starboard engine. The greater the
difference in speed between the control levers the
more the boat turns. To make a sharp turn, move one
of the control lever to reverse for a moment.
7748921 04-2008