[the_biot]

The wikipedia page has some info, looks like various CRC and parity checks. Maybe the receiver was just ignoring them, and receiving faulty data.

I dunno, it seems to me like that GPS receiver had fairly bad software. If you get packets from a bunch of different satellites but one is way off, it seems like good sense to throw that one away.

[mysterydip]

It worked fine everywhere else I went for weeks, so while I'm sure it was a bug of some sort, I wouldn't say it was overall a bad receiver.