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26 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
3 Advanced Operation
Confirming position at the start of a journey
At the start of a journey you must always use an easily identifiable
fixed object to confirm the fix given by the navigation system. Check
for fixed positional errors and compensate for them.
Verifying computed positions
Always verify the computed position with a dead reckoned position,
calculated from the average course steered and the distance logged.
Plot frequency
• In open water, you should make plots at least every hour.
• In confined waters or when near to potential hazards, you should
make plots more frequently.
Setting waypoints
• Local variations in radio signal quality and changes in the tidal
stream can produce deviations from the desired track. When
setting waypoints, remember that deviations can occur.
• Thoroughly check along each track. Check up to 0.5 nm each side
of the track to ensure that there are no hazards within this zone.
Note: For the waypoint advance function to work, the last four
characters of adjacent waypoint names must be different.