I wish to be notified on my Android phone when I get within a certain distance (few hundred m to a km, user adjustable) of a list of locations (imported in lat, long format; about 10..50 entries). Is there an app for this?
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Yes there is, I stumbled about one a couple of weeks ago. Unfortunately I don't remember which it was, as I had no need for it. On a quick glance: Maybe MagicContext can be "abused" for that? It's not the one I had in mind, but the only one that I could find (on a quick check). – Izzy♦ Oct 13 '18 at 10:35
BwareArea might be what you are looking for. From the app's description:
You'll import a POI list and it'll start an always-on-top widget displaying the closest POI and alerting you if you don't follow the POI requirements. All the parameters are configurable; minimal distance to warn, allowed over-speed, whether to automatically start when your car's Bluetooth is connected, or to log your track.
Seems to fit your requirements exactly. Works on Android 4.4 (Kitkat) and up.