"The Chocolate Factory uses WiFi for its indoor maps."
Do the owners/operators of these WiFi units (routers or repeaters, I assume) know that they are being used to provide this Google service and have they given assurances that they will not be moved or their operation modified?
For large public buildings, the owners would probably be very happy to install cheap Wi-Fi units to help in this function and ensure they are not modified without informing service operators.