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I notice my HTC Desire fetches http://xtra3.gpsonextra.net/xtra.bin when it boots (and before I enter the PIN).

What is that ?

Here's the HTTP Request sent:

GET /xtra.bin HTTP/1.1
Accept: */*, application/vnd.wap.mms-message, application/vnd.wap.sic
x-wap-profile: http://www.openmobilealliance.org/tech/profiles/UAPROF/ccppschema-20021212#
Host: xtra3.gpsonextra.net
Connection: Keep-Alive
User-Agent: Android
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1 Answer

up vote 14 down vote accepted

That is done by gpsd. The XTRA files are the current GPS Almanac. The location of where to download the XTRA files to is defined in /system/etc/gps.conf.

These files contain data that speed up the GPS, which will result in faster GPS position fixes.

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