the onlyy one I've seen is the silva.  You have to hold it level and steady
and open the lid to lock the needle.

Realize that no magnetic compass is going to be very reliable in urban areas
when being carried by a pedestrian.  There is just too much iron about  and
the mag compasses are being continuously diverted.

It's different in a car since you can calibrate the compass to compensate
for the engine of the car and that helps keep nearby iron based materials
from diverting the thing.

I've been working with mag compass electronics and with a solid state gyro
to try to average out the errors, and it's a real bucket of worms that I
havn't yet got working to get a repeatable reliable result.

And don't tell me they put them in cell phones, I know that and they don't
work very well.

Tom Fowle
Smith-Kettlewell RERC

On Tue, Sep 07, 2010 at 04:13:34PM -0400, Edward Przybylek wrote:
> Hi all,
> I realize this topic has been discussed before and I did look in the
> archives before sending this message but found the number of messages on the
> topic to be a bit daunting.  I'd simply like to know if anyone is using a
> Braille compass that works reliably for them.  I tried the Columbus Talking
> Digital Compass and I found it to be absolutely worthless.  In a majority of
> the times I tried to use the compass it gave me readings that were
> completely wrong.  I returned it yesterday.  I've seen advertisements for a
> couple of Braille compasses but I'd like to know if they're any better than
> the talking compasses before I go through all the trouble of ordering one
> only to return it a few days later.  Any advice on a reliable Braille
> compass will be greatly appreciated.
> Take care,
> Ed Przybylek
> [Non-text portions of this message have been removed]

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