The SD-502 GPS dongle supersedes it predecessor SD-501 by including 512 MB of built-in memory, allowing for tracking signals and storing data. This is a good way to keep the memory on your PDA free, using the onboard memory GPS for storing maps and such. The device works on Pocket PC 2003, Win CE.Net, and Windows Mobile 2003 operating systems.  On a normal day it will cost you about $150 USD.

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