My Garmin Drive 61 was really frustrating me; sometimes I could save an address to use later, and sometimes there was no [CENSORED/DELETED] Save box in the dialog. I could save trips with 100% ease, but those addresses were giving me pure-D ***. Finally, I had to restore the device to factory-shipped condition. It was a pain in the butt, but now it works like it's supposed to.
And considering that the device was designed to work in vehicles, why can't it adequately charge off the car battery-supplied current?