Took a while to learn the user end...would like to see the manual a little more streamlined for us challenged techno dummies but the device has exceeded it's expectations....I highly encourage everyone to purchase it. The Batteries are on the expensive end but the tradeoff is a device you can count on...an NY buddy and I swap pictures all the time on who is doing what in the jump world...this time no bogus claims (on his end of course) we have documented proof of freefall accuracy.