gpsd protocol
http://gpsd.berlios.de/gpsd.html
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http://www.lion1906.com/Pages/CalculCap.php
Plus a compact flash GPS to a serial port
http://www.headfuzz.co.uk/?q=gpsmain
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http://www.cucy.net/lacp/archives/000023.html
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http://www.visualgps.net/VisualGPS/default.htm
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http://www.cnssys.com/Tac32
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http://jcoppens.com/ant/qfh/index.en.php
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http://www.marengo-ltd.com/gps
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http://shopsourceone.stores.yahoo.net/virwavip.html