DeLorme US Software BU-353S4 with Street Atlas USA 2015 Plus USB connectivity with low power usage-no batteries required. Waterproof for rooftop use. Ideal for vehicle, marine or aviation use. Superior signal retention in urban environments. Built-in roof mount for improved reception. GPS patch antenna for exceptional accuracy Over 7.3 million miles of roads in the U.S, Canada and Mexico. Street level data for U.S., and Canada. Major roads for Mexico. Over 4.5 million points of interest in the U.S and Canada Large screen portability-no internet, Wi-Fi or cell phone coverage required. Includes residential and business phone listings. Link photos, documents and web sites to your map files. Perfect for business as well as personal use.