The app and keyboard’s main purpose to make editing geographical coordinates easier—quite niche use case. For myself, I use it primary for geocaching. But I think it can be useful for others and other purposes as well.
The keyboard extension accompanying app show the full intended functionality. In the standalone keyboard extension itself, however, it is technically not possible to use the map at this time.
The functionality is obvious I think.
Coordinates can be edited either in keyboard own interactive display or map and then inserted in the document, or they can be edited simultaneously both in the document and keyboard display.
Right now, only one coordinates format and basic Apple maps are supported—for the initial release I focused to the core functionality and usability. In future, I plan supporting alternate maps (this also may enable maps in custom keyboard) and additional coordinate formats.
To use the keyboard it is useful enabling its access to Location services (GPS).
The keyboard uses location information to show your local coordinates, your location on the map and to calculate your distance from the edited coordinates.
Your location is in no way stored, shared or sent over the Internet.
Added a link to app Settings with explanatory text about custom keyboards. Minor bug fixes.
With Family Sharing set up, up to six family members can use this app.