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- 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.
-