Simrad AP16, User Manual, Page: 66 / 102

Configuration and setup
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NMEA0183 sentence ‘DBT’ contains no depth offset and the
reading will be from the position of the transducer.
When the depth offset is set to
zero, the indicated depth is
from the transducer to the
bottom.
To read the depth from the water surface to the bottom you have
to set the depth offset according to the vertical distance between
the surface and the transducer, positive (+) value. If you want to
indicate the depth from the keel to the bottom you have to set the
depth offset according to the vertical distance between the
transducer and the keel, negative (–) value.
Automatic tuning
Automatic tuning is a feature that automatically sets the two
main steering parameters ( Rudder and Counter Rudder ) by
taking the boat through a number of S-turns.
Automatic tuning is an optional procedure that is not required for
the AP16 to function. The AP16 is preset with steering
parameters that should steer most boats in the 30 - 80 foot range.
It is, however, recommended to perform an automatic tuning as
part of the sea trial.
Recommended speed during Automatic tuning varies with the
type of boat, but should not exceed 10 knots (6-8 knots is
recommended). It should be performed in calm or moderate sea
conditions.
Note !
Automatic tuning should not be performed at planing speed or in
following seas!
The parameter values calculated during Automatic tuning
becomes the HI parameters. The LO parameters are
automatically set to 66% of the HI.
It also is recommended to perform the Automatic tuning steering
East or West, as this will yield the best balanced parameters.
Note ! After the Automatic tuning has been completed the rudder must
be controlled manually, as the autopilot has returned to STBY
mode.