Seiwa SW AP01 - Manual (Page 18)

2.3 NORMAL OPERATION
Press the STANDBY key. The system does a self-test for a few
seconds and displays the version of software fitted to your autopilot.
When the self-test is complete the normal STANDBY display appears
and shows the current heading of the vessel.
If a fault is detected during the self test, the Controller starts beeping and
the type of the fault is displayed after the self-test period.
Hold down the STANDBY and PILOT keys for a second.
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