I realize you asked about the 810 but I have the 800 and have had no problems with the mapping functions. I downloaded the Open Street Maps(OSM) that I needed and put them on the mini-sd card. I have created routes with Ride With GPS and uploaded them to the 800, set the device to notify turn-by-turn and it follows the routes flawlessly. On a rare occasion, for some stupid reason, it will not give an alert prior to the turn, but other than that it is great. I have found that 'googling' for answers on my problems have given me the information I needed.