we have a Go720 which we purchased new from Halfords in Uk a few years ago with western Europe already uploaded. we have never updated etc until yesterday when we purchased 'USA and Canada' maps as we are spending a few months in USA now. we downloaded tomtom home and downloaded all the suggested updates . I understand that there is not room on the internal memory for both Europe and USA, so we agreed to save western Europe maps to my computer via HOME and upload the USA maps. (I originally tried to do this onto a 8 GB memory card but it wouldn't work, and I found a thread saying they would only work with 4GB or less, so we decided to go the internal memory route instead ). unfortunately after hours of uploading, the device now says 'no maps found' (even after resetting the device). The HOME programme is not helpful- 'operate my device' on the computer says 'no maps found', the 'manage my go' says that the USA and Canada map is loaded on my device! I am confused and frustrated, having already spent hours trying to sort this out!! Please help.