Compasses to avoid?

Discussion in 'OnBoard Electronics & Controls' started by science abuse, Nov 23, 2009.

  1. science abuse
    Joined: Nov 2009
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    science abuse Junior Member

    It's a fairly simple device, but once your over the horizon, nothing is more vital. I have had problems with a Sunto in the past, and thought I might ask here what magnetic compass brands are most reliable and accurate, or which are least reliable.


    Many thanks
    Eric G.
     
  2. Submarine Tom

    Submarine Tom Previous Member

    The compass "swung" properly is usually the most accurate.

    I find the stars to be remarkably accurate.

    -Tom
     
  3. CDK
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    CDK retired engineer

    When the bottom membrane of my Suunto cracked and the oil dripped out, I bought a new one. Because there should be at least one magnetic compass on a boat and because removing the old one left two holes that needed to be covered again. But the price was outrageous.

    For the equivalent of $15 I bought a waterproof fluxgate compass that also is a clock, a calendar and a stopwatch. It is powered by a lithium battery which lasts for more than a year if you don't use the illumination too often. And it is also more accurate than the Suunto.....
     
  4. science abuse
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    science abuse Junior Member

    I do have a couple of good handheld compasses that I use ashore in the mountains and woods. This one needs to be hands-free and easy enough to read from a couple of feet away:
    It will be mounted between my legs, facing up, to give me my heading while rowing. I'm a bit of an oar-tugging enthusiast, and am planning an over-the-horizon trip next August (if you're curious, I'll start another thread in an appropriate forum). A GPS will be handy in emergencies, but when I'm tugging away it will be nice to just glance down to keep her true.
     
  5. Kay9
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    Kay9 1600T Master

    Bigger the card the slower the swing. For a small boat you want the biggest card you can stand. It will swing less in your small boat and make it a lot easier to steer a true (magnetic course). Just remember:
    Dead
    Men
    Can
    Vote
    At
    Weddings

    K9
     
  6. science abuse
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    science abuse Junior Member

    There should be very little deviance from the craft itself, as it's all UHMW with the occasional bit of aluminum. Off hand, I can't think of anything ferrous that will be along for the ride. Even those who question my sanity say I have big brass ones, not iron. :p
     
  7. Kay9
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    Kay9 1600T Master

    Not just ferrous. Also think electronic. IE Phones GPS Radio and such.

    K9
     
  8. science abuse
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    science abuse Junior Member

    Excellent point. The hull being UHMW also begs the same question about static fields.
     
  9. Submarine Tom

    Submarine Tom Previous Member

    Or window rain spinners!!
     
  10. farjoe
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    farjoe Senior Member

    Can you indicate type and from where?
     
  11. CDK
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    CDK retired engineer

    It won't do you much good, but here's a picture.
    Forgot to mention the thermometer function.

    On the back are instructions for calibration and mode switching, all in German. No reference to a manufacturer; I bought it in an Aldi supermarket where it was one of the weekly changing special offers.
     

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  12. farjoe
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    farjoe Senior Member

    thanks...i guess i have to wait until Lidl comes up with something similar. No Aldi around here.
     

  13. science abuse
    Joined: Nov 2009
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    science abuse Junior Member

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