I would not recommend a
suunto for either of these applications. I know several friends who recommend a
core for these applications, but I cannot recommend this. The refresh rate on the
Core is about a second. But for something like parachuting or hangliding where you need absolutely accurate info I would suggest that you get an altimeter designed for these applications.
Don't get me wrong. the
Core is freakin accurate, but it simply was not designed for these applications. If you choose to do so, it it at your own risk..
Hope that this helps,
Kirby