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I haven't tried but i'm sure it is also entirely possible to dl only the gmap folder and then send the entire NA or just CA as you suggested to the [OEM lower49] unit as the new detail map image, but then how do you easily then get [direct from Garmin] the JCV and in the case of entire NA if it's got Voice Recognition and for that matter 3D capability also get those files too without a useless downloading of the OEM-only img direct to the unit? Is there a trick i don't know of to do that?