Got a bit of a strange one I keep loosing GPS signal and sometimes drop down to only 4 satelites when running 8.398 on an x40 device if I remove the memory card and use the x40 as it came then this problem disappears I did buy a new memory card but it's started happening again and also happens if I put the truck navcore on the device and leave just the map on the memory card.

Running as truck it locked onto 4 out of 12 satelites and then when I took the card out so it was running the latest standard navcore I got a lock on 8 out of 11 satelites with the TomTom in exactly the same position....

Any body got any ideas? Can I use navcore 9 GPS files on it?

Should I upgrade to the new truck navcore (is it still broken and you need to select bus?)