Looking through the EULA that pops up when you activate through iTunes:

"Network Charges
When you download Google Maps, we will cover the charge for sending the text message that you need to download Google Maps. However, it is possible that certain carriers or providers might also charge you for receiving this download. Also, depending on your plan and your carrier or provider, you may be charged for use of your mobile phone when you access Google Local information or other Google services through Google Maps."

Does the maps application actually use text messaging? If so, what for?