I got a TomTom 510 a little over a month ago and the unit says the maps of the US include Puerto Rico. However, I don't see a single POI in the database for Puerto Rico. Plus, I am having difficulty finding a major street in Mayaguez, PR. I am flying there tomorrow and was hoping to use this device to drive from the airport in San Juan to Mayaguez, but I am wondering if it will be useless.