Yesterday I received, and watched twice, Shawn's long range hunting video. It was great but a couple of things that were said brought up questions so I contacted Shawn and he explained it very well. I then went back through all of my previous correspondence with Gerald Perry at Exbal as well as with Kestrel. Previously I had contacted Kestrel about my 3500 and was told that in order to read station pressure I needed to input the local elevation in the calibration screen for Barometric Pressure. This I have been doing. I also talked to Mr. Perry about putting in elevation in Exbal and he told me, if I was using a Kestrel, to always leave the elevation at 0. This I have been doing. Now......I watch Shawn's video and he sets his Kestrel BP calibration screen to 0 for elevation and puts in the actual elevation in Exbal. So.......I contacted Shawn and he explained it and why he did it. I then got to thinking so I looked at Kestrel's web site and found the following data. The information with the manual you get with the meter is somewhat misleading. In going over the email correspondence with Gerald Perry I now see that he said to always leave the elevation at zero because typically the Kestrel displays a corrected BP. Don't know if this is of any help but, even though I've always been able to get first round hits using Exbal, I firmly believe that now I will be doing it with far better data. Now I guess I'd better watch it a couple more times to see what else I've missed.