Instruction manual

Tillerpilots TP10/TP22/TP32
16
E04818 Issue 1.0
flashes of the Nav LED indicates that the Tillerpilot is set to
Auto Seastate.
• Use the Port ( ) and Starboard ( ) keys to adjust the
Seastate setting between 0 and 9. Selecting 0 will switch the
Tillerpilot to Auto Seastate.
• Press NAV (CAL) to confirm settings and return to normal
operation.
4.5 Autotrim
Under differing conditions a tiller bias (sometimes known as
standing helm or rudder trim) is applied in order to steer a
straight course. An example is when sailing close-hauled, where
the vessel will normally pull into the wind, and the helmsman
applies a standing helm to leeward, in order to maintain course.
The amount of this standing helm varies according to factors
such as strength of wind, boat speed, sail trim, and amount of
sail set. If no account of these were taken, then the vessel would
tend to veer off course, or pull around head-to-wind when sail-
ing close-hauled.
The Tillerpilot continuously monitors the average course error
and applies a bias to the tiller to compensate, until the optimum
condition is reached (Fig 4.7). This bias, or standing helm, is
applied gradually, so as not to upset the normal performance of
the Tillerpilot. Thus, it may take up to a minute or so to fully
compensate after changing tack. Once optimum trim is reached,
the pilot will still monitor for changes in the prevailing condi-
tions and update the trim accordingly.
Note Autotrim is applied automatically and cannot be manually
adjusted.
Wind &
Tide
Ideal course
C
o
u
r
s
e
w
i
t
h
o
u
t
A
u
t
o
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i
m
Fig 4.7 - Effects of autotrim