On Sun, 29 Apr 2007 17:59:35 GMT, Tom L. wrote:

I entered the same numbers in my Sporty's E6B and got
PA: 998
DA: 1910

Field Elev : 1165
Pressure Alt: 1000
Temp : 21 C

DSSCalc - DA = 1931
CoPilot 1931
Garmin GPS 1930

If you want me to dig out the software I wrote based on "Flight Theory
for Pilots", it's around here someplace...