The aircraft was on a mission with 2 pilots on board to pick up a Piper Super Cub from another field. Suspect that the *co-pilot* was carrying a GPS with him also and I guess it would be possible that the aircraft had 2 on board as standard equipment.
As for data recovery, *most* GPS units record movements and altitudes for a reasonable period even though the user may not be aware of this.
A gent recently in Melbourne was caught in his Toyota Hilux doing over 120kmh, but got off it because his el-cheapo handheld Magellan GPS on the dash kept records of his speed and he wasn't going over 100kmh at the time (verified by a scientific type government department).