the bounces correlates with a lost/gain of stats that are visible to the device... not very nice! Just for clarification - which was the REAL altitude at which you have left the plane?
BTW - the next Version of GPSLogger will include Option to use absolute Elevation values - so the plot will be correct then (when the option is enabled) - looks like the Storm & Bold have serious problems with the correct reading of the GPS data... [just my personal assumption]
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