Yea, but OSM has variable quality by country, and isn’t really a “navigable” map in most places.
You can’t get turn-by-turn directions because they don’t (consistently) have things like lane permeability, turn restrictions, directionality, etc. You can’t get accurate ETAs because they don’t have speed limits or free flow speeds. And traffic data of course. Unless things have changed, routing class and surface type are also unreliable, so a shortest-path graph algo will take you down neighborhood streets or unmaintained roads.
There is a ton of under-the-hood map data, invisible to the end user, that you need to have to be able to deliver a modern phone navigation experience.
You can’t get turn-by-turn directions because they don’t (consistently) have things like lane permeability, turn restrictions, directionality, etc. You can’t get accurate ETAs because they don’t have speed limits or free flow speeds. And traffic data of course. Unless things have changed, routing class and surface type are also unreliable, so a shortest-path graph algo will take you down neighborhood streets or unmaintained roads.
There is a ton of under-the-hood map data, invisible to the end user, that you need to have to be able to deliver a modern phone navigation experience.