DeLorme Earthmate GPS LT-40 Plus [Old Version] USB-powered GPS receiver includes super-high sensitivity STMicroelectronics GPS chipset; DeLorme ConstantLock technology for superior signal retention in challenging GPS environments Voice-guided navigation, automatic back-on-track, GPS Radar to locate travel services, NavMode with optional 3-D perspective and larger, more accessible user controls; link photos, documents and URLs to the maps; print large-format wall maps Locate over 4 million places of interest; GPS-navigate with total confidence anywhere in the U.S. or Canada, and on major roads in Mexico Easy, automatic routing; plan side trips, avoid congested areas, choose back roads; put your contact manager listings on the map and display their map locations, for strategic planning, routing, and more