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Garmin "...requires optional Heading Sensor"

Old 04-30-2008, 08:51 PM
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Default Garmin "...requires optional Heading Sensor"

My intent is to purchase & install a Garmin 4212, with GSD 22 Sounder, XM WX, and eventually the HD 4kw Radar. Garmin indicates the Chartplotter and Radar Overlay require an "optional Heading Sensor" for proper alignment and to allowcollision avoidance feature work properly.

Does anyone have experience with this elusive optional Ga;?rmin Heading Sensor? I have not found it on the Garmin WebSite or on the net. What is the Garmin Part Number, price, etc. Will a generic flux gate compass work?
Old 04-30-2008, 09:05 PM
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Default Re: Garmin "...requires optional Heading Sensor"

it does not really need it - the radar will work ok, but just not stay aligned - it is looking for a digital heading from an AP or sensor such as the KVH autocomp or KVH1000 . It needs the sensor to use the MARPA function of the radar. Seek out the help here of "bluewaterpirate" - a Garmin guru...
Old 04-30-2008, 09:09 PM
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Default Re: Garmin "...requires optional Heading Sensor"

it does not really need it - the radar will work ok, but just not stay aligned - it is looking for a digital heading from an AP or sensor such as the KVH autocomp or KVH1000 . It needs the sensor to use the MARPA function of the radar. Seek out the help here of "bluewaterpirate" - a Garmin guru...
Old 05-01-2008, 03:36 AM
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Default Re: Garmin "...requires optional Heading Sensor"

If you do decide you want the heading sensor you may want to consider waiting for the new GHP10 autopilot Garmin will be releasing later this year. It includes a flux gate compass in the kit.
Old 05-01-2008, 03:43 AM
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Default Re: Garmin "...requires optional Heading Sensor"

garmin doesn't make a heading sensor that is why there is reference to a specific garmin part#. KVH1000 works fine. You are looking for somehting that kicks out 10hz nmea
Old 05-01-2008, 07:30 AM
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Default Re: Garmin "...requires optional Heading Sensor"

The requirement for a heading sensor comes from the MARPA feature, and is common among all manufacturers. Its not just Garmin.
Old 05-01-2008, 07:45 AM
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Default Re: Garmin "...requires optional Heading Sensor"

Radar Overlay works fine, unless you are not going forward. If you are drifting then it wont match up without the KVH.
Old 05-01-2008, 07:43 PM
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Default RE: Garmin "...requires optional Heading Sensor"

It is my observation that the heading sensor provides a better "fit" to the radar overlay on the chart in addition to use in marking targets. I use the KVH Azimuth 1000. It has NMEA output and is much less expensive than the Garmin heading sensor. Look at Defender or Boatersland.

My setup is similar to what you are doing. 4208 plotter (4210 will not fit my dash), GMR 24, and the xm weather. While updating I also replaced my vhf with a dsc unit.
Old 05-01-2008, 08:10 PM
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Default Re: Garmin "...requires optional Heading Sensor"

Awsome, you are all a great source of information. I got thru to Garmin this am (18 min phome wait). They confirmed the KVH 1000 option. Thanks for the guidance. See you on the water. Evans 38

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