The Garmin nuvi 55LM is the #1 selling GPS on Amazon.com. You can pick it up today for a fraction of the retail price and never get lost again! For driving directions on the road, put away the smartphone and power on your nuvi. nuvi 55LM is an easy-to-use, dedicated GPS navigator that does not rely on cellular signals and is unaffected by cellular dead zones. nuvi provides easy-to-follow, spoken turn-by-turn directions with street names nuvi 55LM features a bright, 5.0″ dual-orientation display, for use horizontally or vertically.