For driving directions on the road, put away the smartphone and power on your nuvi from. The Refurbished nuvi 57LM 5 in. GPS Navigator with Lifetime Maps is an easy-to-use, dedicated GPS navigator that does not rely on cellular signals and is unaffected by cellular dead zones. Detailed maps of the lower 49 states are already preloaded plus you get free map updates for the life of the unit. Foursquare connectivity adds millions of new POIs like businesses, stores, restaurants and other destinations. The nuvi 57LM also issues an audible alert and displays an on-screen warning whenever you approach a school zone.