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Well, it could easily be that they hit the CoCom limit on the GPS units they were using: http://blog.jgc.org/2010/11/gaga-1-cocom-limit-for-gps.html

Perhaps the GPS devices were disabled by speed, or altitude, and didn't have time to reset while at apogee to get the reading.



Yes, this. There's an ongoing discussion on arocket regarding these issues. It's a problem for many amateur teams.


I'm surprised they didn't specifically seek out a receiver that implemented the rule correctly. Since it's an "and", not an "or", a proper receiver should have kicked back in by the time it reached apogee.




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