Named for its oversized design and rugged construction, the Garmin Montana 610 GPS intuitively navigates across swaths of expansive wilderness. The high-sensitivity GPS receiver locks onto satellites faster by using Russian-based GLONASS alongside traditional GPS satellites. HotFix satellite prediction gives regular users even faster satellite acquisition by predicting the positioning of GPS satellites up to three-days since its last use. For advanced navigation, the 3-axis, tilt-compensated compass shows your heading on the move. Plus, the barometric altimeter tracks changes in pressure for monitoring fast-moving storm fronts and documenting elevation readings. The Montana 610 GPS features a four-inch, sunlight-readable touchscreen display, with dual-orientation for viewing maps in both landscape and portrait modes. The easy-to-use touchscreen works with gloves in inclement weather. The included shaded relief basemap is supplemented by a one-year subscription of BirdsEye satellite imagery. This high-resolution satellite imagery provides brilliant clarity and detail, allowing users to conceptualize nuances in terrain and environment. Featuring four-gigabytes of built-in memory, the Montana 610 stores up to 4000 waypoints and 200 routes, alongside downloadable maps at extra cost. MicroSD-expandable memory (card not included) allows you to swap out different maps when you're engaging in different activities, such as hunting, backpacking, and boating. Its dual-battery system ensures plenty of juice for extended adventures, with the included, rechargeable lithium-ion battery lasting 16-hours. Three batteries provide back-up power when you're running low in the wilderness. The Montana 610 comes bundled with a lithium-ion battery, USB charging/data cable, AC charger, and instructions.