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Old 05-04-2019, 01:44 PM   #1
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Garmin 7512xsv Chartplotter Gurus

Any ideas how to get the Garmin 7612xsv chartplotter to send nav data to the Simrad AP28 autopilot when the chartplotter is displaying a route created by Auto Guidance?

Both are connected to the NMEA 2000 backbone and can see each other. The AP28 has been set to use the chartplotter data for position and navigation.

If you select or set a waypoint on the chartplotter and then select Go To, the Garmin draws a straight line to the waypoint, the AP28 sees the data, and will start navigating. However, it wants to navigate in a straight line, through land or whatever.

If you select Auto Guidance, the Garmin will draw a route to get there, based on the details specified about your boat, but the AP28 says no Nav data input.

Anyone know how to set up the Garmin to output data during Auto Guidance that the AP28 can consume?

Thanks.

John
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Old 05-04-2019, 02:11 PM   #2
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John,

I researched this subject a year ago. I had installed a Garmin GPSMAP 7212 with BlueChart g2 Vision and wanted to install an AP28 that I had previously purchased for another project. I was told by both Garmin and Simrad that the Garmin Auto Guidance feature was proprietary and only worked with networked Garmin autopilots. So, I now have a Garmin Reactor autopilot and sold the AP28.

Here is what Garmin has to say about it:

Auto Guidance route and autopilot compatibility
Compatible Garmin chartplotters with an installed BlueChart g2 Vision/HD or LakeVŁ HD Ultra card will have access to a feature called Auto Guidance. Auto Guidance will provide a path to the desired destination that will avoid shallow and unnavigable waters. After the Auto Guidance route has been calculated, a suggested route will appear on the screen.

Please note, Auto Guidance will only suggest routes around known obstacles provided by the BlueChart g2 Vision chart, and not any other types of debris, vessels, etc. Sonar data is not taken into consideration for this route, nor any other live information.

The following Garmin autopilots will follow the Auto Guidance route when connected to the chartplotter via NMEA 2000:

GHP 10
GHP 10V
GHP 12*
GHP 20
GHP Reactor
GHP Reactor 40

Non-Garmin autopilots will not support this feature.

FWIW, I really preferred the AP28, but ultimately wanted the tighter integration.
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Old 05-06-2019, 09:55 AM   #3
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I researched this subject a year ago...
Thanks, Larry. After some consideration, I still have the option of selecting a specific waypoint, selecting GoTo, and that will send more generic signals that can be read by the Simrad autopilot. That's fine. That'll work. Select a waypoint over open water for a spot in the Keys or across the Gulf to the panhandle or from Ft Lauderdale to Bimini, press GoTo, and then on the AP28 autopilot, press the Nav button. The autopilot should keep us on course and, I believe, compensate for any cross-track errors. Should be good to go.

Appreciate your insight and knowledge.

John
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Old 05-06-2019, 02:19 PM   #4
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Originally Posted by CaptJohnEasley View Post
Thanks, Larry. After some consideration, I still have the option of selecting a specific waypoint, selecting GoTo, and that will send more generic signals that can be read by the Simrad autopilot. That's fine. That'll work. Select a waypoint over open water for a spot in the Keys or across the Gulf to the panhandle or from Ft Lauderdale to Bimini, press GoTo, and then on the AP28 autopilot, press the Nav button. The autopilot should keep us on course and, I believe, compensate for any cross-track errors. Should be good to go.

Appreciate your insight and knowledge.

John
John,

In addition to waypoint navigation, the AP28 will perfectly follow any Saved Route that you have created and stored in the Garmin. I routinely used this feature on my prior boat to have the Simrad autopilot successfully follow some pretty complex routes.

On the Garmin, select Where To?, Routes?, select a Route, select Navigate To, select Forward or Backward and a magenta line will appear on the chart for you to follow. On the AP28, select Nav to engage and it will follow the selected route. A word of caution though, large course changes will require a confirming touch of the Nav button on the A/P. This setting (Nav Change Limit) is adjustable up to 30į IIRC on the AP28.

Finally, Simrad's name for crosstrack corrected steering is No Drift mode. The Owner's Manual has a description of what it is and how to engage it.

Good luck
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Old 05-06-2019, 02:43 PM   #5
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John,

In addition to waypoint navigation, the AP28 will perfectly follow any Saved Route that you have created and stored in the Garmin. I routinely used this feature on my prior boat to have the Simrad autopilot successfully follow some pretty complex routes.

On the Garmin, select Where To?, Routes?, select a Route, select Navigate To, select Forward or Backward and a magenta line will appear on the chart for you to follow. On the AP28, select Nav to engage and it will follow the selected route. A word of caution though, large course changes will require a confirming touch of the Nav button on the A/P. This setting (Nav Change Limit) is adjustable up to 30į IIRC on the AP28.

Finally, Simrad's name for crosstrack corrected steering is No Drift mode. The Owner's Manual has a description of what it is and how to engage it.

Good luck
Perfect! Iíd rather manually create routes and upload than to trust algorithmically-created auto guidance any day. Canít wait to give this a try this weekend.

John
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Old 05-06-2019, 05:07 PM   #6
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I have a 7612xsv but went with the GHP reactor. The auto guidance feature is nice and works well. Make sure to set your minimum depth and check your route especially near shallow water. It works so well that you may get too comfortable and miss something hard and immobile.
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Old 05-06-2019, 08:57 PM   #7
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I would think you could save an auto generated route. Once saved and then selected it should act as a manually generated route. For example theoretically I can auto generate a route on the IPad Navionics app and send to my Raymarine MFD. I haven’t tried it, but it supposedly is something that works.

Tom
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Old 05-06-2019, 09:02 PM   #8
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I would think you could save an auto generated route. Once saved and then selected it should act as a manually generated route. For example theoretically I can auto generate a route on the IPad Navionics app and send to my Raymarine MFD. I havenít tried it, but it supposedly is something that works.

Tom
Thanks, Tom. Iíll give that a try, too.

John
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