[WriteLog] 6 digit grid direction calculation anomaly

Roger Rehr w3sz at comcast.net
Wed Jan 16 15:43:19 EST 2008

Hi All,

I am wondering if I am doing something wrong with WriteLog.

I am in grid FN20ag and have this entered into WriteLog, and it appears 
properly in the 'mygrid' field in the entry windows.
If I type into the grid field grids that have the same first 5 digits 
as mine, I get anomalous results for those grids due south of me 

The direction for all of these grids should be 180 [degrees], but the 
direction WriteLog displays alternates between 0 and 180 degrees.  I 

Grid   direction
FN20aa     180
FN20ab     0
FN20ac     180
FN20ad     0
Fn20ae     180
FN20af     0

For FN20ah and above I get 0 as I should.

I also find that if I put in the call we3c and have the HamCall lookup 
feature enabled, WriteLog pulls up the correct grid, FN20bj, but gives 
a heading of 311 whereas if I manually enter FN20bj [or just change the 
last digit of the gridsquare from j to j], I get the approximately 
correct heading of 27 degrees.

Am I doing something wrong?

Could someone else confirm or deny that they get similar anomalous 
results with 6 digit grid squares directly south of them in the same 4 
digit square?

If you want to check on how the 6 digit grid fields are structured, see:


Roger Rehr
Roger Rehr

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