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by Rygian 1019 days ago
On Android (and iPhone I guess) OsmAnd is a navigation app that works offline (with map data from OpenStreetMap) and exposes an API as well as examples on how to use its core in other apps [1].

[1] https://osmand.net/docs/build-it/
1 comments
blamazon 1018 days ago
OsmAnd is amazing! I use it for gravel biking and off road driving and it's just incredible at doing turn by turn navigation off a GPX file offline.
link