Simrad NAC-D, Commissioning Manual

Page: 18 / 34

• The system changes from High profile to Low profile when the
speed decreases to 8 knots (= Transition speed minus 1 knot)
AP48 page MFD Autopilot control bar
Set turn rate
Used for setting the preferred turn rate of the boat.
Bring the boat into a turn with the preferred safe and comfortable
turn rate, then activate the
Set turn rate
option to save the turn
rate parameters.
Ú
Note:
The captured turn rate will be stored in the active
steering profile. This setting must therefore be repeated for
each steering profile.
Tuning the autopilot
Ú
Note:
Tuning of the autopilot must be done separately for low
and high speed profiles.
Both Autotune and manual tuning should be performed in
calm or moderate sea conditions.
Providing you have entered correct vessel type, length and cruising
speed, you may not have to perform further manual or automatic
tuning.
Proceed as follows to verify satisfactorily steering:
1.
Stabilize the vessel on a heading, and then select
AUTO
mode
2.
Observe course keeping and rudder commands
- The autopilot should keep the vessel on the set heading
within an average of +/-1 degree, providing calm sea and
wind
3.
Make some small and bigger heading changes to port and
starboard and observe how the vessel settles on the new
heading
- The vessel should have a minimum of overshoot. See
"Rudder
gain"
on page 20 and
"Counter rudder"
on page 21.
18
Sea trial | NAC™ -D Commissioning manual