Use the Reminders app to send an alert when you reach or leave a certain location.
In Reminders, tap an entry followed by the “i” and choose from the options. Turn on Remind me at a location and then tap Location.
Select from any saved addresses within your contacts or search for an address. Once a place has been selected, you can choose When I arrive or When I leave. You’ll also see a pin on a map and a marked circular region.
Drag the black dot on this marked area to increase the radius of where the alert will go off. Tap Details to return and tap Done to save the alert.