Do you Know if maps use magnetic North or true North?

----- Original Message -----
From: Mark McCulley <transporter99@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, February 29, 2000 1:39 PM
Subject: Re: Precision Navigation compass

> Not sure exactly what you mean by "adjust compass deviation". You first
> calibrate the compass by putting it in CAL mode and driving in two
complete
> circles. You can then set the declination according to your location and
> display true north (as opposed to magnetic north). I don't know any
accuracy
> specs but I'm sure this instrument works better than your typical auto
> compass. The compass can detect when it's off (because of an adjacent
metal
> semi, bridge superstructure, etc.) and displays the word "Distortion". The
> display shows degrees as well as direction (N, ENE, NE, etc.). The
altimeter
> shows only elevation, not barometric pressure. For accuracy you must
> calibrate it at a known elevation (like all altimeters except GPS).
>
> MM
>
>
> >From: David Beierl <dbeierl@IBM.NET>
> >Looks pretty cool -- how do you adjust the compass deviation and how
close
> >can you get it (to my mind, +/- 15 degrees is not too bad for an
automotive
> >compass, but +/- 5 would be really nice)?  How sensitive is the
> >altimeter?  How do you set it?  Will it show barometric pressure as well?
> >
> >david
> >David Beierl - Providence, RI
> >  http://pws.prserv.net/synergy/Vanagon/
> >'84 Westy "Dutiful Passage"
> >'85 GL "Poor Relation"
>
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