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- I am an instructor in the Marine Department of Georgian College in
- Owen Sound, Ontario, Canada. Owen Sound is a marine port on Lake Huron
- (one of North America's 5 great lakes). Over the past several years
- I have developed this program which was written in Visual Basic and
- which can be used by the yachtsman or marine student alike.
- To use the program blue background text boxes must be filled
- with the appropriate numerical data (All times in GMT), Yellow check boxes,
- option buttons or yellow text bars must be clicked as appropriate.
- Once all the input data has been supplied the gray command buttons
- are clicked to provide the required solution. The red coloured labels
- are for information only. The long term celestial almanac contains
- all the stars and planets listed in the Nautical Almanac and the
- data will be of use until Dec 1998. The data should be accurate to
- within 0.2 minutes for all bodies except the moon which has an accuracy
- better than 0.7 minutes.
- The main features of this program are as follows.
-
- 1. Mercator sailing 1. To determine the course, distance, and ETA.
- 2. Mercator sailing 2. To determine a dead reckoning position using the
- computer's clock, the course and speed.
- 3. To determine a great circle course and distance and intermediate
- longitudes so the course can be plotted. Composite sailing is also allowed.
- 4. Current vectors are solved.
- 5. To determine a compass fix using two simutaneous compass sights.
- 6. To determine a compass fix using 2 compass bearing on a single
- object (running fix).
- 7. To determine the course made good using 3 sights on one object.
- 8. To calculate distances off using vertical sextant angles.
- 9. To calculate distances off using relative horizontal sextant angles.
- 10. A position fix using 2 to 5 simlutaneous celestial sights or a running
- fix using celestail sights can be computed. All altitude corrections are
- completed. Unreasonable sights can be omitted.
- 11. To calculate the Greenwich Hour angle and Declination and other relavent
- data for a celestial body for any time from 1950 to the end of 1998.
- 12. To calculate the true altitudes and azimuths of the celestial bodies
- and their rates of change.
- 13. To calculate the times of rise, set, meridian passage, and prime
- vertical passage for celestial bodies. Times of twilight can be found.
- 14. A diagram depicting the positions of the celestail bodies can be
- constructed to help identify the object. Click on the body to get its
- name, altitude, and azimuth. Holding this above one's head and orienting
- the North end of the map to the north should make identication easy.
- For use with a black and white printer a black and white option is
- included. Copy the map to the window's clipboard and print using any
- windows program that can print the clipboard's contents.
- 15. The hourly GHA's and DEC's of the celestial bodies can also be
- printed in advance of a voyage.
- 16. Several types of unit conversions can be performed. (British & Metric).
- 17. The ship's magnetic deviation coeffients can be entered by swinging
- the ship. These can later be loaded elsewhere in the program.
- 18. Compass and true courses can be calculated.
- 19. Using tide tables the times and heights of tides can be computed.
- 20. Relative humidity and dew point temperature can be computed.
- 21. A small notepad (Log) is included to record text information about
- a ship's voyage. It features wordwrap, cut, and paste. Don't forget to
- save it under a unique name using the .log extension.
- 22. A dual digital time clock (local time and GMT) is included.
- Set the time zone and amount that your computer's clock is in error.
- This can be done using radio time signals. The time can be read from
- this clock in other parts of the program.
-
- To install this program run the setup program. If using Windows 95 use
- the control panel to install so the program can be easily uninstalled
- if desired.I urge you to freely copy and distribute this program
- to whoever you wish.
- The author will not assume any liability for any errors or incidents
- arising from use of this software. The program is distributed as is.
- The user's comments are welcomed. Send any comments to
- dbell@gc1.georcoll.on.ca. A deluxe verson of this software is available
- from the author that will provide accurate celestial data until the year
- 2050. The cost is approximately $37.00 US.
- I hope you find this program useful.
-
- Happy Sailing!
- Doug Bell