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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:
> Brad,
>
> 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
> > Brad
>
> > -----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
>
> > Brad,
>
> > 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
>
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