Raymarine autopilot + ST4000+ Owner's Handbook Manual page 31

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When the alarm sounds, the pilot continues on its current heading but
displays:
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Responding to a Waypoint Advance alarm
To respond to a Waypoint Advance alarm:
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Note: Waypoint advance only operates if the ST4000+ is receiving
valid bearing to waypoint and waypoint number information.
Low Battery alarm (LOW BATT)
The ST4000+ activates the Low Battery alarm when the supply
voltage drops below 10 V (±0.5 V).
Responding to a Low Battery alarm:
To respond to a Low Battery alarm:
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Watch alarm (WATCH)
The ST4000+ activates the Watch alarm when the autopilot is in
Watch mode and the timer has reached 4 minutes.
Setting the Watch timer
To set the Watch timer:
1. First, you must configure the WATCH screen as one of the data
2. When you have done this select Auto, Track or Wind Vane mode.
ST4000+ Wheel & Tiller Autopilots: Owner's Handbook
the boat arrives at the target waypoint and the navigator accepts
the next waypoint
you activate the Man Overboard (MOB) function in Track mode
the bearing to the next waypoint
the direction the boat will turn to take up that bearing
check that it is safe to turn onto the new track, then press track to
accept the waypoint advance
alternatively, you can cancel the alarm without accepting the
waypoint advance by pressing: standby to return to hand
steering, or auto to return to Auto mode.
press standby to clear the alarm and return to hand steering
start the engine to recharge the battery
pages for display (see page 104).