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Internet is useful for updating the declination "constants" for your location. Otherwise, the compass is not really very accurate in all locations.

https://www.rei.com/learn/expert-advice/compass-declination....

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My next milestone is to implement magnetic declination correction using GPS. That way, the app can provide more accurate results by adjusting magnetic readings to true north while still respecting user privacy. Thanks for the great suggestion!

Would be great to have the option to input a major city and have it in a lookup table instead of requiring gps to be on and additional permissions.

This doesn't work like that, mate! OSM has a tile server limit policy because it operates on donations for the server. We need to adhere to this, so I do as much as I can to limit the tile server use. Once I have enough users. I will self-host it and add additional features. Thanks for asking.

Do you really need a DB lookup for declination? I'd imagine it can be worked out from lat/long and a single stored magnetic north location (although I suppose that might need updating).

Yeah, magnetic declination can be calculated using just lat/lon from GPS location.

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