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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