[aprssig] KC8UCH balloon over western PA right now, reaching NE Maryland by 10am

Eric Christensen eric at christensenplace.us
Mon Apr 2 14:24:27 CDT 2007

How about by speed.  If the speed goes to zero then you are probably on
the ground.

Eric W4OTN

Gregg Wonderly wrote:
> Wes Johnston, AI4PX wrote:
>> Since most trackers only have two mode, maybe a way to shut off the
>> GPS would be via impact sensor of some sort.  Modes 1 and 3 are very
>> similar, maybe there's room here for a compromise that would allow
>> this idea to work with only two modes?
> Depending on density of air, the deployment of the parachute might
> create an "impact", so be careful about how this happens.  I'd say turn
> it off based on altitude changes.  If the altitude doesn't change by
> more than XXX feet between reports, you are down on the ground.
> Gregg Wonderly
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