A month ago I visited my parents, who had purchased TomTom One. In that area (mostly forest and farmland...) in Finland the TomTom maps are full of errors so that the guiding instructions are completely wrong. In one area TomTom is asking to go to a "road" where there is no road at all! The same road database errors exist in Google maps as well as Wayfinder maps. (So the Nokia Maps (Wayfinder) has no advantage there.) Actually their purpose was to use GPS navigator when walking in forest (hunting, etc.). For that purpose the TomTom (or any other car navigation GPS...) is completely useless. I had my N810 with MaemoMapper and Finland topographic maps and they were very impressed. Next time I go there they asked to bring them one N810... even when I tried to told that the GPS is not exactly that good (fix time...), but regardless they still insisted to have one. Also my sisters husband who saw it said he wanted to buy my N810 on the spot! He asked if I could bring him as well one, but hasn't confirmed yet. (We asked the N810 price on local Nokia shop and they asked like 470Euros... So purchasing it locally there is out of question. ) As a summary, not even "professional" GPS navigator can overcome the restrictions of poor maps. Second, not everyone is needing a "hold hand and guide me" type detailed instructions when driving... just a map showing current position and roads nearby is adequate, at least for me. For that purpose MaemoMapper is perfect... and is suitable for "off the road" use like hunting, hiking, geocaching, etc.