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Has anyone used or contributed to OpenStreetMap?
(coeus.sbs)
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I found OsmAnd~ to not only be good on foot, but also on bike. It sometimes plans more aggressive routes than google which saves time (side streets for less distance, opposite directions on one ways...). Take this with a grain of salt though, because I ride primarily in NYC.
What Google does (I see it as remains from early days of how it became good) is it takes into consideration the route other people took. So if a lot of people do an illegal u-turn, there's high probability you'll be proposed such route too.
It works the other way round too. If a lot of people don't take an optimal route for whatever reason, there's less probability it'll propose it to you.
OsmAnd just tries to connect the dots postman-np-problem style