Skydive

So how are people using the Decent for Skydiving. I just picked one up and I used to use my SUUNTO that worked great for skydiving. I see the decent has apps for everything except for skydiving (sorry, the Jump master looks to be for military HALO). I am wondering if I could just create an app that you could set AGL to 0 and would just display AGL. Can anyone tell me the refresh rate of the Descent's barometer. The SUUNTO is fast enough for skydiving, I am figuring the Decent would be as well...

Thanks for your help