Using memory navigation is limited to the area you save onto the memory. It is a fairly small area. As for the CD-UB100, you'd have to be lucky and find one. Dont forget this is an outdated deck.
I know this is an old thread but I have the same problem and looking for a fix. The hardware data says antenna connection is ok and shows a bar or 2. It just wont move while driving. I also got an antenna off of ebay. solutions?