Thatsityeah

Hi. My gps in the columbus navigator looses position and could be showing the cars position out by a few hundred metres to hundreds of miles. There doesn't seem to be any reset option in the system. It makes the system useless as it is wrong more often than not. I have no idea why it doesn't locate correctly or indeed why it gets it perfectly other times. Anyone else have this issue and manage to figure it out? I have a 2009 Octaves. Thanks