Mapping and GPS applications

Hello everyone,
I have just bought the Sony Cyber shot camera with GPS tagging for metadata. I see having this ability a great thing for images and their use. I am interested to hear if others have this camera and what problems they have had with the GPS. Mine is erratic to say the least. I primarily want this so I can attach the information to other older images taken not only by myself but for historic images which have been made digital.
Thanks louise