Garmin Nvi 3790t 43inch Portable Gps Navigator What if one device could help you navigate anywhere in the U.S. andCanada, while offering travel tips, storing your favorite tunes and photos, providing translation assistance, and more? That device is here, and it’s not much bigger than a deck of cards. The Garmin Nvi 3790t 43inch Portable Gps Navigator is set to revolutionize what we expect from a GPS navigation device, or from any device for that matter.