Chap t e r 3 : A d van c e d Oper at i o n
21
Saf et y
Passage making in Track mode removes the chores of compensating
for wind and tidal drift, and will aid precise navigation. However, it is
important to maintain an accurate log with regular plots.
Posit ion conf irmat ion at t he st ar t of a passage
At the start of a passage you must always confirm the fix given by the
position transducer, using an easily identifiable fixed object. Check for
fixed positional errors and compensate for them.
Verifying computed positions
ïVerify the computed position with a dead reckoned position,
calculated from the average course steered and the distance logged.
Plot f requency
ïIn open water, plots should be at least hourly.
ïIn confined waters, or when potential hazards are near, plots should
be more frequent.
ïLocal variations in radio signal quality, and changes in the tidal
stream, will produce deviations from the desired track.
Set t i ng w ay point s
ïWhen setting waypoints, remember that deviations will occur.
ï Thoroughly check along each track.
ïCheck up to 0.5†nm each side of the track to ensure that there are no
hazards within the zone.
General
The use of Track mode will enable accurate track keeping even in
complex navigational situations. However, it cannot remove the
responsibility of the skipper to ensure the safety of his vessel at all times
by careful navigation and frequent position checks.
3.2 Operation in Vane mode (WindTrim)
Vane mode, also known as WindTrim, allows the ST4000 Plus to
maintain a course relative to an apparent wind angle. It uses wind trim
to eliminate the effects of turbulence and short term wind variations,
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