Bill shock - CAD 446 for data to use Google maps while driving in the USA

The Spec reports a case of CAD 445 for using Google Maps, driving in the USA, not for the service but the underlying data.

It also mentions a Rogers customer a saying:

I used my Internet on my iPhone for maybe 10 to 15 minutes while waiting at the airport in the Bahamas and came home to a $367 charge. I complained to Rogers about the ridiculousness of these roaming charges and how the disclosure policy of sending texts wasn’t good enough.