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1993-09-01
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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