Contact: yugo1997zazen@gmail.com
Settings → Supported cities → "Request a city". Cities are added without an App Store update. A covered city is fetched when you arrive, or ahead of a trip.
Shadows come from building footprints and heights. Street trees, elevated roads, walls and temporary structures are not included. Tokyo's building data is the national survey as of 2022, so anything built since is missing; the app says so on the map.
Outside a covered area, with a GPS fix worse than 65 m, or at night, Hikage answers "unknown" rather than guessing.
The iPhone computes and the watch displays. Keep the iPhone nearby and both apps up to date.
Check that Health reading is allowed. Time in daylight is measured by Apple Watch, so days without the watch have none.
Walks, favourites and downloaded cities all live on the device. Deleting the app deletes them.