Ok, I bought this program and have been using it. I just am not sure I am using it the best way in terms of "field Condition Data" I want to just use the Pressure and not the altitude. Is that the most accurate way? To do this do I just put a 0 in altitude, UNcheck " Calculate Standard Pressure" and enter the Pressure from my Kestrel? Thanks for any advice on this. I just want make sure this is the best way. Jeff.