Dave,
Thanx for providing your valuable input, it's a very interesting site.
I was told by the County Enginnering office that the declination for
this location (Sussex County, NJ) was about -11.5 degrees. When I
ran the program on this site I was astonished to find that it reported
the current declination as -13 degrees. I wondered why this was so.
So I ran the program for the period of the last 40 years, in steps of
5 years. To my surprise the declination changed over 2 degrees
over that time period. So be careful where you get your data,
USGS maps, engineers, etc. The data you get may no longer be accurate.
This may have no bearing (no pun) on HF antenna orientation, but for the
VHFer or EMEer using narrow beam-width arrays this may pose a problem.
Model: DGRF55 Latitude: 41.08 deg Longitude: -74.68 deg
Elevation: 500.00 ft Range of Interest: 3/31/1958 - 3/31/1998, step 5.00
--------------------------------------------------------------------------
Date D I H X Y Z F
(yr) (deg) (deg) (nt) (nt) (nt) (nt) (nt)
1958.25 -10d 52.6m 72d 15.4m 17389 17077 -3281 54345 57059
1963.25 -11d 0.1m 71d 55.9m 17683 17358 -3374 54202 57013
1968.25 -11d 11.0m 71d 29.9m 18060 17717 -3503 53971 56913
1973.25 -11d 22.6m 70d 57.7m 18506 18143 -3650 53630 56733
1978.25 -11d 41.2m 70d 26.0m 18860 18469 -3820 53064 56316
1983.25 -12d 5.7m 69d 59.2m 19102 18678 -4003 52444 55814
1988.25 -12d 26.5m 69d 36.3m 19287 18834 -4155 51877 55346
1993.25 -12d 44.7m 69d 15.4m 19444 18965 -4290 51341 54900
1998.25 -13d 2.6m 68d 54.7m 19592 19086 -4422 50806 54452
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
73 de Walt Kornienko - K2WK - zak@goes.com
-----Original Message-----
From: Dave Bowker <dbowker@shire.sjv.net>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Tuesday, March 31, 1998 6:09 AM
Subject: [TowerTalk] True North/Magnetic Declination Calculator
>There is an on-line calculator available at the National Geophysical Data
>Center site for determining the Earth's magnetic field parameters for a
>specific location.
>
>http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl
>
>Dave, K1FK
>Fort Kent, ME
>
>--
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