This check-in mode uses the location abilities of a phone to verify a person's presence at check-in time.
Location abilities rely on GPS and cell-tower locations, which are most reliable
outside. So, your group should really have a clear view of the sky when they check-in.
We have a dedicated
inside check-in method
here.
You can try using the map for indoor check-ins (many of our customers do!), but about 5-10% of your group’s phones may report ‘too far away.’ It all depends on the type of building you’re in and the surroundings.
Be prepared to do some manual check-ins.