new NavSpark GPS module for high accuracy DGPS and RTK
I just got a Synergy Systems SSR-6Tr timing gps with ublox LEA-6T module, which I heard about from a posting here by Dale Robertson on 12 Dec. 2012, "Finally a (relatively) inexpensive u-blox LEA-6T board in the US" diydrones.com/forum/topics/finall
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