Volvo Penta D3 Operator's Manual page 13

Instruments and Controls
Ignition switch
The start keys are supplied with a plate bearing the
start code to be used when ordering spare keys. Keep
the code beyond the reach of unauthorized people.
S = The stop position.
0 = The key can be inserted or removed.
I = Operating position. System power is connected.
II = Not used.
III = Start position. Starter motor is engaged.
There is always a main helm station on a boat. It is the
only helm station with an ignition lock. The ignition
must be switched on here in order for other helm sta-
tions to be used.
Read the starting instructions in the Starting page 52
chapter to make sure you use the correct start proce-
dure.
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