Well, Im glad to see you have stepped up to an iPad (I know, I know, but you know I love apple).... did you get a wifi only version? The cellular versions have built in GPS antennas. Thats why I ponied up for a 128gb cellular version. I don't actually pay for cell service though, I just hotspot from my phone. I also have Motion X GPS app, and have downloaded a lot of detailed maps of the SoCal/AZ/NV areas onto it (why I got the 128gb version, lots of space for maps)... Works like a champ and will even remember routes and waypoints along the way, without service, and no extra external GPS antennas.
And one more thing, what happened to your Ram Mount? Want to off load it? Im sure it'll fit in the '07, right?