Here's an example (It is through geofencing, and I read my parent comment as a bit misleading. Sorry about that.): https://www.locationsmart.com/solutions/proxi

Here's an example (It is through geofencing, and I read my parent comment as a bit misleading. Sorry about that.): https://www.locationsmart.com/solutions/proximity https://www.locationsmart.com/solutions/proximity