I integrated my Bluetooth Kestrel with my ballistic program. It is very nice to be able to get all the information including wind compass bearing from the vane setup. Enter in the range and compass bearing of the rifle and automatically calculate component wind values. I didn't like the USB setup. No real programming changes were required since the BlueTooth link acts like a COM port just like the USB hookup; also, the USB setup didn't give wind compass bearing. Major step forward. If I could afford a BlueTooth Range Finder I wouldn't have to enter anything into the little computer.