

You should also include the standardized name of the body the coordinates are relative to. Need to be able to differentiate between lat/long on Jupiter vs on Earth (where lat/long are much more “crunched” aka more precise with shorter floats).
This will be important if intelligent extraterrestrial life is found, or when Musk ships himself to Mars for the good of humanity.
For what it’s worth, on Windows,
AppData\Roaming
is intended to be shared across devices to some extent (there’s more nuance but the point being I’d be less worried about syncing data from there).