Raymarine p70 User Reference page 39

Using AutoTack in wind vane mode
The SmartPilot has a built in automatic tack facility (AutoTack) that
turns your vessel "relative" to the wind angle you're currently on, and
it tacks the vessel to put you on the opposite relative wind angle.
1
Item
1.
2.
3.
4.
AutoTack is always relative to wind angle and so is not adjustable.
The time delay between activating a tack and the pilot applying
the helm is adjustable and can be found in the Sail boat settings
menu: Main menu > Set up > Auto pilot calibration > Sailboat
settings > AutoTack delay >.
1. To AutoTack to port: press the -1 and -10 buttons together.
2. To AutoTack to starboard: press the +1 and +10 buttons together.
You can also access auto tack function from the Main menu, Main
menu > Tack port or Main menu > Tack starboard.
Pilot modes
3
2
4
Description
Starting position
Tack
Wind direction
Final position
When you AutoTack in wind vane mode, the boat turns through the
AutoTack angle. The SmartPilot will then trim the heading to mirror
the locked wind angle from the previous tack.
Operating hints for wind vane mode
• Always trim your sails carefully to minimize the amount of
standing helm.
• Reef the headsail and mainsail a little early rather than too late.
• In Wind Vane mode the SmartPilot will react to long-term wind
shifts, but will not correct for short-term changes such as gusts.
• In gusty and unsteady inshore conditions, it is best to sail a few
degrees further off the wind so that changes in wind direction
can be tolerated.
• Avoid using Auto Tack in conditions where the wind may shift
suddenly.
D12117-1
Caution: Allow time
Allow time for course changes
Caution: Major course changes
When making major course changes, the trim on
the boat may change substantially. Due to this, the
SmartPilot may take some time to settle accurately
onto the new course.
39