Thanks for the compliment(s)! I'm working away on this thing, and should have the next run of it with RECCO decode on the way before I finally head to bed tonight. (Shows what Mountain Dew in the veins can do for programming skills...)

I don't know if anyone has the know-how here, but I do have one question about recon decoding I haven't cracked yet. On both RECCO and Supplementary reports, there is a report of the millibar level the plane is flying at. I can understand most of them, but one is reported as follows:

"8..D-value in geopotential decameters (if negative, 500 is added to HHH)"

This one I don't get. Does anybody know what mb level this line would refer to? I'm more curious to know if a line is encoded as /8100, what meter height would it be? If it were /3100, I know it would be 3000m+100=3100m.

Oh well, still some things to learn. If these hurricanes keep rolling, this thing is going to turn into a big program....keep getting work and school canceled. (3rd time this year, not consecutively).