With text-to-speech and enhanced coverage of Canada and Alaska, the rugged Garmin nuvi 550 GPS offers a powerful suite of navigational features for driving, biking, boating, geocaching and more. Specialized cycling, marine, automotive and pedestrian modes offer specific features for a wide array of activities. Bright 3.5 in. color display offers easy viewing in nearly all lighting conditions backlit screen is also viewable at night. Turn-by-turn voice prompting names streets to help avoid confusion automatic routing combined with accurate, detailed road maps keep you on track. Intuitive touchscreen controls make it easy to scroll through and select options. Comes with detailed City Navigator road maps and of the United States including Alaska and Hawaii and Canada. 3D mapping interface provides next turn information, current speed and zoom controls. Geocaching mode makes it fun and easy to search for hidden caches. Supports lat./long. grid and datum information for use with a paper map. Compatible with MapSource TOPO 100K and 24K topographic map software and BlueChart software for boating sold separately. High sensitivity receiver provides rapid first fix acquires signals in urban canyons and under dense foliage. Expandable memory with the addition of a micro SD card cards sold separately. Mini-USB connectivity makes loading maps and other digital content quick and easy. Removable, high capacity battery enables extended outdoor use-up to eight hours. IPX7 waterproofing withstands accidental submersion one meter deep for up to 30 minutes.