Built for the outdoorsman, the Garmin e-Trex Vista HCx features a high sensitivity GPS receiver, electronic compass and a barometric altimeter. Garmin has introduced a line of e-Trex units that feature a high sensitivity WAAS GPS receiver that are able to receive a signal, even under heavy tree cover. The Vista HCx has a built-in electronic compass to determine bearings while standing still, and a barometric altimeter for increased accuracy of elevation readings, to help you along on your next hunting or hiking excursion. At a tiny 4.2"H x 2.2"W x 1.2"D and only 5.6 ounces with batteries, the Vista won’t weigh you down or take up too much room in your pocket or bag. Whether you are in a canyon, under heavy tree cover or in a city with tall buildings the Vista HCx will guide you along safely. The Vista HCx includes the routable Americas Recreational basemap, including major highways, interstates and bigger lakes and rivers. The maps look great on the 1.3 ”x 1.7” high resolution color TFT display and it is even viewable in direct sunlight. The Vista HCx has a microSD card slot for memory cards that will accept detailed maps from Garmin’s Optional MapSource software. With the Mapsource City Navigator North America software you will be able to get visual turn-by-turn guidance on this tiny wonder. Garmin is also offering some of their more popular MapSource titles, like the Topo USA, BlueChart Americas, and City Navigator Europe, on Pre-Programmed microSD cards. Blank microSD cards are available in multiple storage sizes to hold loads of maps. Included with the Vista HCx is a USB interface cable, so map downloads are much faster than traditional handheld GPS units. Garmin has also added audible alarms for off-course, proximity waypoints, and anchor drag. The operation of the unit could not be any easier, allowing a novice to use it for hiking, biking, Geocaching, or getting you to your favorite fishing holes. Other features include: storage for 1000 waypoints with symbol, 10,000 tracklog points, stopwatch, hunting/fishing calendar, and trip computer.