@bomo, maybe you could be a bit more specific: * Re rerouting details: which details do you want to adjust? In general, its all expected to be working out of the box, without any adjustments needed. To know the internal parameters - which router did you use in Poor Maps (Mapzen, OSM Scout, ...)? * Re lock on streets: I presume you mean something like shown as a map matching service at https://mapzen.com/blog/map-matching/? Its possible to implement it, would need some time though. The router behind Mapzen and OSM Scout (Valhalla) does support map matching and we could implement it for online and offline navigation. "Just" have to expose functionality, connect it to Poor Maps, and allow users to enable/disable it. I wonder whether you have terrible GPS signal and rerouting is triggered too frequently?