Simrad AP28 Technical Information download pdf (Page 61)

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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’.

Range Default

Auto – Apparent - True Auto

VMG optimizing

Optimizing the VMG to wind will be active for 5–10

minutes after a new wind angle has been set and only

when beating.

‘VMG’ will be displayed below the mode index when the

VMG optimizing feature is active.

Range Default

Off - On Off

Layline steering

Layline steering is useful when navigating. Cross Track

Error (XTE) from the navigator will keep the boat on the

track line. If the XTE from the navigator exceeds 0.15

nm, the autopilot will calculate the layline and track

towards the waypoint.

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Simrad AP28 Technical Information Page 61