Well I tried the 3970 firmware but custom POI import doesn't work so rolled back to 2760 and made a custom nav disk with fixed cameras and school zones which looks like the best that I can do at the moment. Pretty happy with the result though, its not that difficult to create a new disk every few months with new speed cameras added. SD card would be ideal but if we lived in an ideal world we wouldn't have 2 year old nav data on our expensive Columbus units!!

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