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CoMaps - OSM Updates
(feddit.org)
Cooperative community open-source fork of Organic Maps, an offline privacy-respecting not-for-profit OpenStreetMap GPS app for your phone.
If I recall, in OM repositories there are the scripts to generate mwm files, but the developers said it takes a long time, hence they deliver the update once per month roughly, I guess it take several days if not weeks to process the entire planet.osm
Iirc it took OM 3days, but on CMs temporary hardware it takes 10 days.
Well, much less than I expected