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Newbie AP.question...

Old 06-16-2019, 06:42 PM
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Question Newbie AP.question...

So I am a new AP user (Garmin) and my question is, When the AP is engaged, how much should the heading deviate from the fixed/hold course heading?

Today I was out in slightly windy and choppy conditions doing 23 knots, engaged the AP and I noticed the heading on my plotter would deviate 5, 6 or 8 degrees from the course heading of the AP. I could really notice the boat steering back and forth in an effort to stay the course. Is this typical?

Last edited by Fish'nFool; 06-16-2019 at 07:44 PM.
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Old 06-16-2019, 07:57 PM
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It depends on a lot of conditions. But overall, it doesn't sound bad for an AP.

But when the boat is bouncing around, all bets are off. Just too much variation to get a stable heading.

But on a calm day, if you are always a few degrees off, you can set a manual correction and tighten it up.

A few degrees is pretty normal. I've finally gotten mine really tight, but it took a lot of calibration and sea trials. I think the last block to fall in line was garmin's latest update. Now, everything lines up.

You need to check and make sure no metal is near your compass ball. Then run through the sea trial wizard diligently. Then, fine tune it manually if needed. Fine tuning can fix the wiggle, but it is an advanced setting.
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Old 06-16-2019, 08:20 PM
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Thanks.

What is the process to fine tune it?
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Old 06-17-2019, 04:05 AM
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Originally Posted by Fish'nFool View Post
What is the process to fine tune it?
its all described stepwise in detail,
within the Installation Instructions for your AP

Beyond the initial "Wizards" one can enter "Dealer Configuration"
to adjust the heading, and also the way the AP responds:
there are several adjustable settings -
Acceleration Limiter, Rudder Gain, Rudder Counter
how quickly it turns, how quickly it corrects itself to stay on course

Last edited by Fwpratt; 06-17-2019 at 05:19 AM.
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Old 06-17-2019, 06:35 AM
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Thanks.

Can you adjust how much deviation from the course heading is allowable to prevent more dramatic rudder input swings?

The amount of noticeable rudder movement just seemed excessive to me. By way of comparison, I could hold the course better driving the boat in those conditions than the AP.
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