Probably just have to look at the instruction manual. NCR used to sell a watch that had a peak recording feature. If its not in the instructions, I suspect there isn't a way to do it.
10 ft accuracy is much better than you can do with even Rocksim. However, the watch's accuracy would be affected by it's mounting (i.e. venting, etc) and ability to respond to quick changes.
Ah true. I due belive it is not a high preformance altimiter because it takes about half a second to disply the altitude but its free and I guess I got what I paid for.
An interesting experiment would be to fly the watch with another altimeter and compare the results. If you don't have one, I bet you could talk someone else into letting you fly it along side theirs.