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No, it's price, main chip, ports (serial, BT, etc.), size, compatibility to unit/software (ARM, RISK, etc.), the number of NEMA sentances it broadcasts.
Things are not as easy as you think. For instance, the CF GPS receiver mentioned above needs a seperate BT holder to run BT.
Sorry, it's just not that easy. Look at a reputable company, cost, and compatibility with your PDA and proposed software.
Mark
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