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1997-02-01
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47 lines
Release 1.1
May, 1989
Garry Barker, VK5BUB
GCP: A Great Circle Program
This program was written for the potential benefit of all amateur radio
operators and may be distributed freely to anyone interested. No
responsibility is taken by the author with regard to the accuracy,
currency or usefulness of the program.
The initial release of the program was an attempt to sample the
usefulness or otherwise of the program and to judge the benefits of
further development based on feedback (or lack of it) and so, it had a
few niceties omitted.
The release discussed in this document (Release 1.1), incorporates the
following enhancements:
Some performance improvements through improved mathematics
A more consistent menu interface
Removal of a printing bug
Inclusion of degree marker numbers on the circumference of the
printed circle
Ablity for users to specify their own reference locations for
inclusion on the printed map
Ability to exclude reference locations from the printed map
Ability to specify spacing of radial markers in both degrees and
kilometres on displayed and/or printed map
Ability to exclude radial markers from displayed and/or printed map
Requirement for about 20K more memory (enhancement??)
All work was done using the author's own time and resources. The
hardware included a PC1 with maths co-processor and colour graphics
adaptor, with 640K of RAM and 1 hard disk. The printer used was a 4201
Proprinter.
The mathematics for distance and bearing calculations were taken directly
from the ARRL Antenna Book, 14th edition, page 16-4.
My thanks go to Garry Herden (VK5ZK), Hans Smit (VK5YX), Tony Stanciewicz
and Chas Franks for their help in testing and timing the operation of the
initial release of this program on their equipment. Thanks also to those
who offered suggestions and other feedback on that release. It all gave
me the incentive to produce this next release.