G'day again. Yep, on SD. x:\Garmin\JCV\*.jcv. I suppose the big maps is CNNTNA, what's the smaller one? With gmapprom naming that's probably an oem map, it's not a really old NA is it? If it something else, you could also move it to the SD in a Garmin root folder named gmapsupp.img. There can be 2 maps in there for 7xx, the other named gmapsup1.img. You've got some crazy-old modified dates on some of those files.
BTW, this info could have been found by searching [that's the [Only registered and activated users can see links. ] i mentioned].