Chapter 2: Basic Operation 13
2 Basic Operation
• the position sensor (GPS, Loran, Decca) is receiving a low
strength signal – this will clear as soon as the signal improves
The autopilot stops adjusting the heading as soon as it loses data.
Waypoint Advance alarm (NEXT WPT?)
The ST4000+ activates the Waypoint Advance alarm whenever the
target waypoint number changes. This occurs when:
• you select automatic acquisition by pressing track from Auto
• you request waypoint advance by pressing track for 1 second in
Track mode (with SeaTalk navigators only)
• the boat arrives at the target waypoint and the navigator accepts
the next waypoint
• you activate the Man Overboard (MOB) function in Track mode
When the alarm sounds, the pilot continues on its current heading but
displays:
• the bearing to the next waypoint
• the direction the boat will turn to take up that bearing
Responding to a Waypoint Advance alarm
To respond to a Waypoint Advance alarm:
• 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.
Note: Waypoint advance only operates if the ST4000+ is receiving
valid bearing to waypoint and waypoint number information.
Shallow alarm (SHALLOW)
The ST4000+ activates the Shallow alarm if it receives a shallow
depth alarm via SeaTalk:
•press standby or disp to cancel the alarm
Man Overboard alarm (MOB)
The ST4000+ activates the Man Overboard alarm if it receives a man
overboard (MOB) message from another instrument on the SeaTalk
81131_7.book Page 13 Wednesday, March 17, 2004 3:59 PM
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