Motorola has quietly released its new GPS units – MOTONAV TN20 & TN30 – and the two are going to be for sale only at RadioShack. The TN20 rocks a 3.5-inch touchscreen with NAVTEQ provided maps and more than one million searchable points of interest. The big bro TN30 is equipped with all the TN20 functions, but has a larger 4.3-inch touchscreen along with Puerto Rico and Canada maps. Allegedly, these units are available now for $199 and $299 respectfully only at Radio Shack – besides this one on eBay.