So we're having some confusion. The APRS standard for reporting altitude is feet. However, because we wanted to keep this project all in metric for consistency's sake, I set our GPS to report in meters. We don't actually know if the data that we're getting is in feet or meters. APRS says it's in feet, but we think (and hope) it's in meters.
There's really no big difference, right ?
Anyway, either way, we're about to pass 30000... units. If it's feet, then our payload is going in the drink. If it's meters, then we're right about to pop.