# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Magnetic Variation (Declination) Calculator
From: Irv Haworth
Date: 2009 Aug 4, 18:09 -0700

```What am I missing? When one is in the magnetic pole area  the "needle"
points down (only is it horizontal at the equator)... To best of my
knowledge gyro compasses do not function too well at either pole.  Lastly in
these areas all directions are south..and let me add that the variation
between the GP and Mag P must be 180�
Now for another bevy ,in order to better meet the barrage..
Himself aka Irv

-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf
Of Greg Rudzinski
Sent: Tuesday, August 04, 2009 5:46 PM
To: NavList
Subject: [NavList 9354] Re: Magnetic Variation (Declination) Calculator

If a navigator walks around the magnetic pole(as apposed to the geographic
pole) then it is the gyro compass that holds steady while
declination/variation changes rapidly. Therefor when near the geographic
pole use the magnetic compass to stay on track and when near the magnetic
pole use the gyro compass to stay on track.

On Aug 4, 4:36�pm, Greg Rudzinski  wrote:
> Professor Manoj C. Nair of NOAA was kind enough to answer all my
> questions by email and he explained to me that due to the convergence
> of longitude at the geographic pole there will be large change in
> declination(variation) as you walk around the pole with compass in
> hand but the compass needle will be steady and unchanged as it seeks
> the magnetic pole. A simple concept that I should have been aware of.
>
> On Aug 4, 2:33�pm, Greg Rudzinski  wrote:
>
>
> > Manoj C. Nair of NOAA University of Colorado responded to my email
> > reguarding the zero result for 90� of latitude and said that the
> > current program recognizes latitudes above 89.999 as undefined. The
> > zero result must be a default number. I noticed another program
> > glitch where 13� West declination was displayed as 167� East.
>
> > Greg
>
> > On Aug 4, 10:20�am, Brad Morris  wrote:
>
> > > Hi Greg
>
> > > I just entered the pole for a gee-wiz kind of exercise. �To my
surprise, it returned zero, so I tried a location close to the pole. �That
returned non-zero, indicating that the software has some sort of bug.
>
> > > Since I have no way to verify any other result it may present to me, I
will distrust the data. �How many other lat long locations give 'bad' data?
�How would I know?
>
> > > Should NOAA fix this? �Certainly. How silly of them to permit an entry
which provides erroneous results.
>
> > > Do navigators depend exclusively on a compass within 366 feet of the
north pole? �I sure hope not...
>
> > > Best Regards
>
> > > -----Original Message-----
> > > From: NavList@fer3.com [mailto:NavList@fer3.com]
> > > On Behalf Of Greg Rudzinski
> > > Sent: Tuesday, August 04, 2009 1:03 PM
> > > To: NavList
> > > Subject: [NavList 9329] Re: Magnetic Variation (Declination)
> > > Calculator
>
>
> > > It looks like values above 89.998996� of latitude are all zero
> > > instead of 14� 24'W. Does NOAA need to correct this since it is
> > > only 366 ft from the pole?
>
> > > Greg
>
> > > "Confidentiality and Privilege Notice The information transmitted
> > > by this electronic mail (and any attachments) is being sent by or on
behalf of Tactronics; it is intended for the exclusive use of the addressee
named above and may constitute information that is privileged or
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