Warranty after fix for GTA02 GPS rework for SD card interferenceissue

[Andy Green]

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Somebody in the thread at some point said:
| steve schrieb:
|>   Amaybe when SD I/O occurs one could use the accelerometers to dead
reckon?
|
| Dead reckoning without gyros is pretty hard.  In theory, the two
| accelerometers are not mounted in the same place and thus could be used
| to derive rotation, but in practice they're pretty close to each other,
| and given the noise of measurement one is unlikely to derive a good
| rotation from them.

I don't think we need to worry about it, but in fact we wouldn't need to
dead-reckon.  All we would need it for would be to put a ceiling on
claims from noisy GPS about what accelerations we could have
experienced.  If the GPS sample says we jumped 100m in 1s, but the
accels didn't really see anything, we could ignore or meddle with the
GPS sample.

Whether that is any better than just filtering between previous and
later samples I doubt.

- -Andy
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