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Garmin Heading Sensor?

Old 09-19-2018, 06:55 AM
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Default Garmin Heading Sensor?

Looking to add radar (either Fantom 24 or Fantom 54) and Sirius XM weather to a 26' CC with 7612xsv and a second 7612.

Garmin list a 9 axis https://buy.garmin.com/en-US/US/p/pn/010-11417-20

and a 3 axis https://buy.garmin.com/en-US/US/p/pn/010-11417-00

Why is the 3 axis $250 more than the 9 axis?

Is it worth the difference?

Any other compatible options?
Old 09-19-2018, 07:19 AM
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Can't answer your question but only make it more complicated by saying a Garmin Steadycast may also work for you and is even cheaper.
ttps://buy.garmin.com/en-US/US/p/572462
Old 09-19-2018, 11:10 AM
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Steady cast may not work well at very slow speeds.
do you already have an AP? If so you can use that for heading sensor, even thru 0183.
Old 09-19-2018, 11:25 AM
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The 11417-00 heading sensor is an older discontinued Airmar branded H2183 heading sensor. The newer 9 axis is what you want and is cheaper as they were able to make it cheaper with modern technology improvements etc.
Old 09-19-2018, 11:26 AM
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you looking for overlay or marpa or both. The Garmin unit does use COG to do overlay. Which is calculated by GPS when vessel is underway. Just an FYI
Old 09-19-2018, 11:51 AM
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Originally Posted by Salmonbum View Post
Steady cast may not work well at very slow speeds.
do you already have an AP? If so you can use that for heading sensor, even thru 0183.
I just installed a Steadycast and seems to work well at slow speeds as well as when stationary.
Old 09-19-2018, 12:38 PM
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Originally Posted by mfeen1 View Post
you looking for overlay or marpa or both. The Garmin unit does use COG to do overlay. Which is calculated by GPS when vessel is underway. Just an FYI
I am wanting to use overlay and MARPA.
It is my understanding for MARPA to work correctly a heading sensor is needed.
Crazy the older sensor is more expensive than the new sensor.
Old 09-19-2018, 12:41 PM
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I do not have an AP.

Reading the Garmin site it does not say the steady cast is MARPA compatible or incompatible.
Old 09-20-2018, 04:19 AM
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just try Steadycast does not cost much and works
Old 09-20-2018, 04:34 AM
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Originally Posted by heatzig View Post
I just installed a Steadycast and seems to work well at slow speeds as well as when stationary.
that's good to hear. How slow will it be accurate to? We troll down to 1.7 mph at times.
Old 09-20-2018, 07:09 AM
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Originally Posted by tangledline View Post
I am wanting to use overlay and MARPA.
It is my understanding for MARPA to work correctly a heading sensor is needed.
Crazy the older sensor is more expensive than the new sensor.
You will most certainly want the 9 axis heading sensor.
Old 09-20-2018, 07:17 AM
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The whole point of steadycast is to provide heading data at 0 speed. Anything above 0 and the boat can use COG. Steadycast is not fast enough to be used for Marpa though. You'll want the newest 9 axis heading sensor.
Old 09-20-2018, 09:19 AM
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Thanks for the help.

Will order the 9 axis.

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