The Genie wrote:
Hi,
Does anyone know of any software I can install with windows XP that
if I were to input a "point of origin" NGR and a receiving station NGR
would give the range in Km and bearing wrt to magnetic north.
UK ONLY
Cheers,
Mike



Hi, Mike,

As Joe recommends get a copy of W6ELProp if you have even
the slightest interest in HF propagation.

W6ELProp does not do magnetic bearings that I can tell.

As far as I know the only program that does magnetic bearings
is my freeware, lat/long/grid-locator,
distance and bearing (true and magnetic), Miles/Watt,
MaxiMUF, DX database... program GCGC
which uses an ellipsoidal earth model
with WGS-84 as the default.
Just give it Lat1/Long1 and Lat2/Long2 (nearly free format),
or with less accuracy due to the nature of grid locators,
grid1 instead of lat1/long1,
and/or grid2 instead of lat2/long2
See the link below.

The offset from true to magnetic (compass) bearings uses
the World Magnetic Model which calculates the local
horizontal magnetic field direction within a degree or less
(local magnetic anomalies excepted).

For Windows XP, use GCGC in a DOS window that is opened
by running "cmd.exe.)

"NGR" = ??

BTW, the best online tutorial on distance and bearing calculations,
with worked examples, is Ed Williams's Aviation Formulary.

http://williams.best.vwh.net/avform.html


Have fun.

Cheers, 73,

Ron McConnell


N 40º 46' 57.9" W 74º 41' 21.9"
FN20ps77GU46 [FN20ps77GV75]
Magnetic Variation = 13.0º W in October 2003

* GCGC executable and source at

http://home.earthlink.net/~rcmcc

There are 10 kinds of people:
those who understand binary arithmetic
and those who don't.