What do I need to implement a digital map with GPS and routing support?

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I need to create a digital map with GPS and routing support for a local tour trail project.

I've got the drawing of the map which looks like the following for example.



Constraints:

• I cannot use Google Map.
• I need to support GPS.
• I need to show routes.

What I think I need to do:

• Collect Latitude and Longitude of all the routes in the map?
• Collect distance of all routes and intersections Collect roadinformation Use
• A* algorithm to find shortest path

What else do you think I need to do? It will be a small map with 2km radius.



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