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Pioneer Compass Location

Old 04-15-2007, 01:21 PM
  #1  
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Default Pioneer Compass Location

I have a compass problem. When I'm headed south, my compass says I'm headed south. Then when I head north, my compass says I'm headed east.

Here's a picture of my factory installation:


I popped the compass out of the hole in the dash to adjust the compensation. (Afterwards I got on the Ritchie site and learned that I can only compensate for 20 degrees) I was headed north, and the compass was pointing east. As soon as I lifted the compass out of the hole, it pointed north. So I guess the magnet in the compass is attracted to my tach.

Here's a picture of a newer Pioneer. They're using a new compass that sits up quite a bit higher.


Are there any other Pioneer owners experiencing the same problem? Secondly, any suggestions how I can fix this? Does Ritchie make a base for their binnacle mount compasses that would raise it up an inch or so? Could I possibly switch the tach and speedo? Or would the speedo cause the same problem? Maybe I could use some starboard to raise it up a little?

Thanks,
Jeremy
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Old 04-15-2007, 08:54 PM
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Default Re: Pioneer Compass Location

Is this happening only with all your systems powered up or all the time? Has it just started to occur? Have you added or replaced any
electronics? Has there been any electrical work done under the console? Have you removed the sounder/GPS to the right of the compass
to see if there is any difference? Normally a compass deviation like this is constant if it caused by nearby electromagnetic interference. Veeeeerrrry
interesting. Is it possible to move the boat & trailer through 90 deg & see if the deviation is the same? On larger vessels, a deviation card is drawn
up when a compass is "swung". This card shows the true mag reading at any particular compass reading.
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Old 04-15-2007, 11:03 PM
  #3  
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Default Re: Pioneer Compass Location

This has happened since I've had the boat. The electronics were powered up, but I really don't think its the gps. When I power up the gps, I don't notice the compass swing. But when I lift it out of the hole its mounted in, it swings about 90 degrees. I'm pretty sure there's a big hunk of metal in the tach, and the compass is mounted almost touching it. Is there a way to shield the tach? I'm betting my only option is to get the compass up and away from those gauges.

Thanks,
Jeremy
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Old 04-15-2007, 11:29 PM
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Default Re: Pioneer Compass Location



Hi Jeremy,

Tricky indeed. Used to be, years ago, all wiring near compasses (each run of pos & neg) was twisted. This cancelled out the electromagnetic field from each wire & so the compass was unaffected. A compass can be affected by a mass of iron or steel alone in close proximity. Could you remove both the tach & speedo & see what happens. That is not going to solve your problem but may at least show the direct cause if the compass card swings to where it should be pointing. As you have been able to fix the problem by removing the compass from the console, that may be the best & easiest fix. Cover the existing hole & fabricate a new mount or perhaps, probably simpler & cheaper, purchase a new binnacle style compass & sell the old one.
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