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- INTRODUCTION
-
- NAVLOG is a program for mariners that make blue water passages.
- It enables easy calculations and recording of navigation data. Using
- the inputs of latitude, longitude, and time, it calculates distance,
- course, and average speed between two navigational fixes. It also
- records each set of position data, thereby providing a permanent
- record of a passage. I have found this information to be very useful,
- but it is often been too much work to do manually. NAVLOG easily
- provides this information, and it saves wear and tear on navigational
- charts. NAVLOG is written in MicroSoft Quick Pascal.
-
- The navigation calculations used in NAVLOG assume a flat earth
- resulting in rhumb lines and true courses. The program assumes north
- latitudes and west longitudes. In comparing navigation calculations
- with my GPS navigator, I found the results are very accurate.
-
- LIMITATIONS
-
- [1] Maximum time between fixes is 23 hours and 59 minutes.
-
- [2] Latitude 0 to 60 degrees, Longitude 0 to 100 degrees.
-
- [3] Maximum distance in edit mode -- 99.9 nm.
-
- [4] Maximum number of logs in program directory -- 50.
-
- [5] You must use the proper format for data entry. i.e.,
- for time use the space bar between hours and minutes.
-
- Example: 09 00 Do not use 09:00
-
- The same applies for position coordinates. You must also enter
- tenths of minutes.
-
- Example: 18 05 2 Do not use 18 05.2
-
- [6] If you use the edit feature, entering "=" will preserve
- the original data. If you change a time or position by
- editing, the program does not recalculate. Adding a new
- position (Update mode) to a log with an edited last time or
- position will result in normal calculations. However, unlike
- normal data entry, you must enter a period between minutes and
- tenths of minutes in edit mode.
-
- Example: 18 05.2
-
- [7] This program is not intended for navigational planning.
-
- I would appreciate your comments or suggestions to improve the
- program.
-
- Joel R. Graffman
- 2855 SW Lakemont Place
- Palm City, FL 34990
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