Lost Memory
I'm not too sure what a GPS 12 is, but how long did you leave the batteries out of it before putting new ones in? Also, have you been back outside where it can pick up signals?I have a Map76 that if you take to long changing batteries, will lose all user programed memory, and everything that I have in it has to be put back in. The factory data remains, but the unit has to be taken back out side to that it can receive signals before it will reprogram itself.I may not have explained that very well, but if you haven't been outside since you changed batteries, try that. Also, if you have an outside battery source (cigarette lighter plug in), plug it in the next time you change batteries and it will not clear the memory. If not, changing the batteries one at a time also helps. If not, call Garmin's customer service. I have dealt with them on a couple of occasions and they have always been helpful.Good Luck!