Re: [PSUBS-MAILIST] Tired of Going in Circles

[john <mongo14904@yahoo.com>]

Hi all 
Just thought id add that We use a scuba divers compass
mounted in the front of the forward view port in the
conning tower and it works great.. not much if any
distorsion at all
John  (Lake diver)

--- Cliff Redus <dr_redus@devtex.net> wrote:

> I am assuming it would have some effect.  This
> calibration can be repeated 
> when the boat is in the water off the trailer. All
> you have to have is a 
> laptop attached to the magnetometer and some help to
> rotate the boat in the 
> water.
> 
> Cliff
> ----- Original Message ----- 
> From: "Ray Keefer" <Ray.Keefer@Sun.COM>
> To: <personal_submersibles@psubs.org>
> Sent: Thursday, October 21, 2004 3:45 PM
> Subject: Re: [PSUBS-MAILIST] Tired of Going in
> Circles
> 
> 
> > Hi Cliff,
> >
> > I just had a horrible thought. If you rotate your
> sub while on its
> > trailer. Will the steel in the trailer have any
> effect on the readings
> > when off the trailer? Hopefully with the "compass"
> mounted high enough
> > the trailer will have no influence.
> >
> > Regards,
> > Ray
> >
> > Cliff Redus wrote:
> >> As any  magnetometer will be effected by the
> steel in the hull, I
> >> am planning on mounting my unit external to the
> hull behind the
> >> pilot viewport in an non ferrous, water tight
> pod.
> >>
> >> signal.  The documentation for the unit has both 
> "hard iron" and  "soft
> >> iron" calibration procedures for nulling out the
> effect of the hull.
> >> This is done while boat, with sensor attached, is
> rotated slowly 360
> >> degrees.
> >>
> >> Cliff
> >
> >
> >
> >
> >
>
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