Simrad AP28 Operator's Manual page 64

Tack time
When performing a tack in WIND mode, the rate of turn
(tack time) can be adjusted. This will give single-handed
sailors time to handle the boat and the sails during a
tack.
A turn performed without shifting wind side, will also be
made at a controlled turn rate.
Tack angle AUTO
In AUTO mode the set tack angle replaces a similar
change of the set course using the starboard and port
keys.
Wind function
With 'Wind function' set to 'Auto', the autopilot will
automatically select between apparent and true wind
steering. 'Auto' is default and recommended for cruising.
When the boat is running, it will also be surfing on the
waves. This may lead to significant changes in boat
speed, hence changes in apparent wind angle. True wind
steering is therefore used when running, while steering to
apparent wind is used when beating or reaching.
'Apparent' wind steering is preferred when you want to
achieve maximum boat speed. The autopilot tries to
maintain a constant apparent wind angle to get
maximum thrust from a given trim of the sails.
When sailing in closed waters, the apparent wind angle
may change temporarily due to wind gusts. It may then
be preferred to sail to the true wind; select 'True'.
64 | Main menu
Range Change per step
2 - 50
Range Change per step
50 - 150
Default
1
Default
1 100
Units
12 second
Units
°