Quote Originally Posted by feelay View Post
Pretty sure the store bought cards aren't "writable". They don't want people to copy them so they aren't able to store new info or be copied.
That is sort of what I thought, so if someone went to the trouble to survey, say, the river channel, they would have to switch map cards to look at the "new" data? Sort of like a map of a different lake? Just wondering how the unit would treat that data, as the GPS data internal to the unit would tell it to use its own internal map of the lake, even if you pulled out the "storebought" card?