I have exbal for a dell axim pocket pc. I have been reading quite a bit about what data to plug in from my kestral into exbal. To get station pressure from kestral i use 0 for the reference altitude. I have read that for most ballistic software that you use either corrected pressure and the altitude, or zero out the altitude and use station pressure. I have read that using station pressure and 0 altitude is the most accurate way to use ballistic software. However i have read that with exbal you need to enter station pressure as well as altitude. Is this true, and if so why would this work? wouldn't this be way off? So with this program, when would i check the "calculate standard pressure" box? Also why is it that it wont let you type in data sometimes depending on other data you filled in. Sometimes it fills stuff in for you and wont let you change it. Can someone just explain to me how to use exbal with a kestral please? I tried emailing perry systems but the email said it couldn't be delivered. Does anyone have an updated email address or phone number for them? Thank you for all the help.