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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics > Fluxgate compass and the st4000 Wheel "HELP"
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Thread: Fluxgate compass and the st4000 Wheel "HELP" Reply to Thread
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Topic Review (Newest First)
05-18-2013 03:44 PM
tibtib
Re: Fluxgate compass and the st4000 Wheel "HELP"

I would try and find out if there is something magnetic onboard that is causing your problems. Bring a handheld compass aboard and take readings in different locations (including near but not right next to the boat's compass and fluxgate sensor). You can use a the handheld compass to "hunt" for a source of magnetic interference. If the handheld readings are ok everywhere, then I would suggest that you troubleshoot the problems separately. You can "swing" the main compass yourself and at least get it to be somewhat accurate - Google can help you find specific instructions for your unit. The fluxgate should be tested as per http://www.raymarine.co.uk/knowledge....cfm?view=3798 to make sure it is working ok.
05-13-2013 02:16 PM
ltgoshen
Re: Fluxgate compass and the st4000 Wheel "HELP"

Quote:
Originally Posted by Maine Sail View Post
Has your vessels compass every been professionally swung to know it is accurate?
Not that I kow of. How you I have had? How much would it cost to have somthing like that done? is it somthing I can do?


Quote:
Originally Posted by Maine Sail View Post
Did you do your calibration circles and have it take..? Do you have any ferrous metal objects close to the flux gate? Pots, pans, tool bags, speakers etc. etc..
No! I did not do my calibration circles. I had to do a repair "well" I had to exchange my mooring ball on my storm anchor it was sinking and not holding up the chain. I hope to get the circle calaberation done as soon as possable.

My bigest problem right now is that both the compass and the Flux-gate are only 25 Degreese off of each other but are both heading in the wrong direction?
With 360 being north and 180 being south: its just reading like 209 degrees when the boat is tied up at the dock at like meg 340 degrees?
05-12-2013 09:01 AM
Maine Sail
Re: Fluxgate compass and the st4000 Wheel "HELP"

Quote:
Originally Posted by ltgoshen View Post
I asked the wrong question.
Can I dile in the fluxgate compass usint the control head for the st4000?
Or what is the the 3 circle procedure for this process? It is the first time I have tried to use the auto helm st4000. When I put it on auto it holds the course just fine its just reading like 209 degrees when the boat is tied up at the dock at like meg 340 degrees?
Can I do a large dile in then swing the the boat for deveation?>

Has your vessels compass every been professionally swung to know it is accurate? Did you do your calibration circles and have it take..? Do you have any ferrous metal objects close to the flux gate? Pots, pans, tool bags, speakers etc. etc..

Even when you get it swung and calibrated they are rarely if every spot on with the ships compass but you can get them darn close.
05-12-2013 07:40 AM
capecodda
Re: Fluxgate compass and the st4000 Wheel "HELP"

Your fluxgate looks like it's mounted fine. Pointing the right way, etc.

Now you got me stumped, you say you should be reading around zero degrees magnetic, and you are reading in the low 100's of degrees both binnacle and fluxgate. If one was wrong, I'd have some advice.

Are you docked next to a huge magnet?
05-11-2013 10:44 AM
ltgoshen
Re: Fluxgate compass and the st4000 Wheel "HELP"

Quote:
Originally Posted by capecodda View Post
When you say behind a settee, is it mounted on a bulkhead (wall that is port/starboard) or behind the settee so it's facing sideways? Sounds like this stuff was partially installed and never tested.
Here is a photo before all the work was done on the boat.
Here's the thing, I went back to the boat yesterday to check some things after doing some reading on the manual. My boat is docked in her slip pointing north for the most part. both the the Auto-helm and the steering binnical show around 108 degrees. Actual the Auto-helm was 112-115 and the binnical was 108. "Well that's south?? What the hell does that mean?





05-11-2013 08:45 AM
capecodda
Re: Fluxgate compass and the st4000 Wheel "HELP"

When you say behind a settee, is it mounted on a bulkhead (wall that is port/starboard) or behind the settee so it's facing sideways? Sounds like this stuff was partially installed and never tested.
05-10-2013 02:11 PM
ltgoshen
Re: Fluxgate compass and the st4000 Wheel "HELP"

Well, First off i'm not sure it was ever working well or properly. When I got the boat all the insturments were in a box. They looked new. Bur the transducers were allready installed. The Fluxguate in mounter just above the back rest of the first settee bench seat on the starboard side. Thats like 4.5 feet from the engine nothing close there to create a field? The other thing I have never realy looked at the accuricy of the helm compass? I will start there this afterneoon. then I will swing the fluxguate an Saturday. If all else fails I will add a correcting 'offset' to your fluxgate as per the instructions.
check my hook up and clean. Anything more?
05-10-2013 12:37 PM
Faster
Re: Fluxgate compass and the st4000 Wheel "HELP"

Pretty sure you can add a correcting 'offset' to your fluxgate readings. IIRC it's the last part of the commissioning process in the manual.
05-10-2013 10:41 AM
capecodda
Re: Fluxgate compass and the st4000 Wheel "HELP"

The setup process I am sure is available someplace on line if you google the manual for your autopilot.

That said, my guess along with the other advice you are getting is that if the fluxgate is reading that far off (I'm assuming your binnacle compass is reading good here), it is likely that is is close to something magnetic. If it worked well before, you may have moved a magnetic object close to the fluxgate sensor in the boat. Not that I've ever done that

Other possibilities, all of which have happened to me on different boats different years.

- I've had a builder place the fluxgate sensor too close to a deck wash pump, which has magnets in it of course.

- I've had a fluxgate fail. Some of them have a gimbal in them to keep the sensor level, and I've had that break internally to the fluxgate sensor.

Good luck.
05-10-2013 09:37 AM
knuterikt
Re: Fluxgate compass and the st4000 Wheel "HELP"

Quote:
Originally Posted by ltgoshen View Post
I asked the wrong question.
Can I dile in the fluxgate compass usint the control head for the st4000?
Or what is the the 3 circle procedure for this process? It is the first time I have tried to use the auto helm st4000. When I put it on auto it holds the course just fine its just reading like 209 degrees when the boat is tied up at the dock at like meg 340 degrees?
Can I do a large dile in then swing the the boat for deveation?>
Have you tried to follow the procedure for swinging the fluxgate?

A difference of 131 degrees is much...
What is the correct heading when you are tied up at the dock?

If it is the fluxgate that is off, you must check for any magnetic sources close to the heading sensor, lumps of iron (engine, fire extinguisher ++) , electrical components.

Worst case the heading sensor must be re-positioned.

It cold also be the magnetic compass that are off..
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