The Colorado 300 is Garmin''s newest member of the handheld line High sensitivity GPS receiver Innovative Rock ???n Roller input wheel Wireless sharing of user tracks, waypoints, routes and geocaches between units SD card slot for optional mapping and user data storage User configurable profiles: recreation, automotive, marine, fitness and geocache Colour TFT screen with 240 x 400 pixels resolution Waterproof to IPX7 standard Works for up to 15 hours on 2 x AA batteries (not supplied) Electronic compass, barometric altimeter, temperature sensor JPG image viewer can display pictures from the SD card Supports Geocaching.com GPX files for complete cache descriptions and hints Includes USB cable, carabineer clip, Trip and Waypoint Manager software, manuals on disk and quick start guide This rugged unit with a high sensitivity receiver offers unique features such as a new Rock ???n Roller wheel for one handed operation, as well as the ability to exchange waypoints, tracks, routes and geocaches wirelessly between units. In addition, you can customise your Colorado with five different user profiles: outdoor, marine, automotive, fitness or geocache. The SD card slot on the bottom of the unit is ideal for loading additional MapSource detail. The Colorado has a rugged, metal-look and slim design and features detailed mapping and a high resolution, colour display. The Colorado 300 features a built-in worldwide basemap with shaded relief which enhances the map presentation on the unit. It is simple to load optional new maps for different types of adventures using the SD card slot or 384 megabytes of internal memory.