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. Switch Location on, and then choose from the options.
You can choose Home, Getting In or Getting Out of the car, or a Custom location. This lets you set a circle around an area on the map. Of course, you can also choose Current location, too.
Once set, tap Done in the top-right corner of the screen to save the alert.