You can sometimes find them on ebay. If you buy the blue chart cd, you get one area download with it. This way you can also put that area on your computer, and it is very handy to have. You will need to also buy a blank chip, if you decide to go this way. Either way, be sure to check on ebay.
Unless you purchase a preprogrammed card you need to get a data card reader..got ours from e-bay as well. I installed two regions on our card...each region is about 15meg. I paid about half of what it costs at WM. At the time (two years ago) the data cards were up to 128meg, probably much more now.Terry
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