Just an up date on this.

I use a 4gb sd card in the GPS (with Ozi Maps) and have kept the original 2gb SD card as my backup of the base GPS software etc.

It only just occurred to me that I did not have this 'go slow' problem when I first got the GPS and it has gotten worse over time so I slotted in the the back up sd card - guess what - works fine. Tom Tom updates three times a second instead of my usual once every 10 secs.

So I will format the 4gb SD card and reload everything and see what happens.

Cheers

Garry