See how your phone can confirm you are in a certain area on the map
Find your location on the map,
Click on it to place a marker.
Download and install the app on your phone.
Apple App Store
In the app, enroll in the class:
[...need to click on your location first...]
Walk around your location tapping the "Check me in" button on the app...
...and see how the app can figure if you are inside or outside of the red circle.
Find and click on your location