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rnbr
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rnbr010.txt
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1998-04-23
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RNBR version 0.10
05 April 1998
RNBR will calculate the distance (range) and compass angle (bearing)
from one location on Earth to another. Within the limits of rounding,
and because the Earth is not a sphere, the distance may be in error
by a few kilometers. As of version 0.9, a different method of
calcuating distance from one point to another is implemented.
The Haversine Formula is credited to R.W. Sinnott. Now at version
0.10, some screen formatting problems and one calculation bug
are fixed.
The program also calculates the Maidenhead Grid Square for locations
in the northern hemisphere and west of the zero meridian. The actual
range and bearings are more than adequate for beam headings.
New for version 0.10
When the mathematics of calculating the bearing involves an almost
divide by zero problem, at very short distances (range) the program
will not attempt to calculate the angle, and offer a default text
string.
CTRL-C will exit the program if something should go wrong. Remember
that in AMOS Basic, you can switch between the AMOS screen and the
normal Workbench screen with the CTRL-A key combination.
Among those persons who may find this program useful are Amateur Radio
operators.
When first run, the program looks for the latitude and longitude of the
Amateur Radio station from which the beam antenna will be pointed.
It won't calculate anything until the local coordinates are entered,
and when you save the coordinates, the file MYLOC.LONGLAT will be
written to the current directory.
RNBR is an exercise in AMOS BASIC. Future versions of the program
should have some sort of graphic representation of the Earth, but
this version (0.10) does not.
The author of RNBR Robert Davis K0FPC
bobdavis@cadvantage.com