TrustedReviews have looked at the Mio DigiWalker C520t

Personally, I reckon they should be touting sat-nav's green credentials. After all, having fewer people driving around aimlessly for miles with no idea of how to get to where they want to go is bound to reduce our national carbon dioxide output. But no, strangely enough it's stuff like widescreens and traffic avoidance systems that seem to get the manufacturers excited.

Mio DigiWalker C520t Review