Thanks Hugo Nebula
I agree entirely with your comments that the system is limited and a road atlas is probably just as good at a fraction of the price.
I was beginning to think that its operation was impaired by my advanced age or lack of brain cells!
When using it recently it found a short cut I would never have dreamed of - although it took twice as long and was 50% longer!! I think they call it the scenic route - Best wishes
 
The RNS-310 is a proper crap unit... Not a shade on the RNS-510.