Thread: Time-to-First-Fix with N810 GPS
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adaviel is offline adaviel
2008-05-02 , 17:05
Posts: 52 | Thanked: 22 times | Joined on Apr 2008
#35
Originally Posted by tz1 View Post
It would be interesting to see how the nvd_data changed under differing conditions (on under open sky, restart 5 minutes later, restart indoors, etc.).
I have collected 300 copies of nvd_data, mostly without physically moving the tablet but just by turning off, waiting a bit, then turning on.

The file contains several sections of hex-encoded data. Sometimes, when there is only a few seconds delay since the last on/fix/off cycle, only about
50 bytes change. Other times, about 900 bytes change, or some intermediate amount. I tried looking for data sent to the chip as seen with strace, but didn't see any. Either I did it wrong or the data is reformatted. I guess I was hoping to see something simple, like the
last position or UTC time, but it's not obvious. Anyway, Nokia have the
documentation and if they are working on a fix, that's great.

If anyone is actually interested in this data, let me know (send me an email).