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1988-08-31
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** N4AZI Memory Resident Maidenhead Grid Square Locator System **
Copyright <C>1988 David C. Eanes, N4AZI
4866 Drusilla Lane
Baton Rouge, La. 70809
-------------------------------------------------------------------------------
This program is offered solely for the private, non-commercial use of Amateur
Radio Operators. The program may be distributed to others provided that there
is no commercial interest or payment of any kind involved.
*** THIS IS NOT PUBLIC DOMAIN SOFTWARE AND IS FULLY COPYRIGHTED ***
If you find this program useful and are so inclined a $5.00 donation to the
author will be greatly appreciated and will help to promote the development of
other tools that are helpful to the Radio Amateur.
-------------------------------------------------------------------------------
GRID.EXE is an MS-DOS terminate and stay resident (TSR) program that calculates
maidenhead grid squares for any given latitude and longitude or it will
calculate longitude and latitude for any given grid square. In addition to the
location calculations, the program also provides data on bearing and distance
between any two locations.
To load GRID.EXE into memory, simply enter 'GRID' at the DOS prompt. From this
point the program can be called up at anytime by simultaneously pressing the
<CTLR><ALT><G> key combination.
OPERATION
Once the program has been activated by pressing <CTRL><ALT><G>, there are 4
possible commands.
The 'H' command puts the user into the Home or Source data entry mode. The
cursor moves to the Home Grid Square entry and at this point the user enters
the Home Grid Square. The program will pad or fill in incomplete grid squares
so that entries such as 'EM' or 'EM4' will be accepted. An entry such as
'EM40' is padded to 'EM40LL'. After the grid square has been entered the
program then calculates the longitude and latitude for the supplied Grid
Square. By simply keying <RETURN> at the Grid Square entry the cursor is moved
to the Longitude entry position and next to Latitude entry position. Once both
have been entered the program will calculate the correct Grid Square for that
location.
* Important note: All longitude and latitude information is entered in decimal
degrees (ie -91.2 Long 30.5 Lat | NOT in degrees,minutes,
seconds). West longitudes and south latitudes are entered as
negative numbers.
The 'D' command functions exactly the same as the 'H' command except that the
user is entering data for the Destination location. Once there is data entered
for both Home and Destination the program will automatically calculate distance
and bearing.
The 'Q' command simply halts execution of GRID.EXE and returns the user to
whatever program he was running previously. The program remains resident in
memory and can be re-activated at anytime with the <CTRL><ALT><G> combination.
The 'U' command Uninstalls or removes the program from memory. After a 'U'
command the program cannot be activated again until it is reloaded.
WINDOW POSITIONING
Upon initial activitation the Pop Up Window will be positioned near the upper
left hand corner of the display. Window position may be adjusted through the
use of the Arrow, PgUp, PgDn, Home, and End keys. Subsequent activations will
maintain the window position that has been selected by the user.