Free Location API

The Free Location Api is a free implementation of the JSR-179 Location API for J2SE. It also extends the functionality to allow aggregating of multiple location technologies and seamlessly transitioning between them. (GPS, BT, WLAN,...)

This is only a dummy site, more to come...

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Several interesting links:
The JSR-179 Location API [Javadoc] [Download the PDF]

The Location Stack

Universal Location Framework: A Reference Implementation

Location Inter-operability Forum (LIF)

Part of the Code (NMEA Parser, Serial Port receiver ...) come from
http://sourceforge.net/projects/gpsmap/

Exact distance calculation on the surface of an elipsoid
http://samblackburn.com/gfc/index.html
(Java version under development, provisional result can be seen under http://thek.org/emoges/)