Explore More Colorado 300 comes with a built-in worldwide basemap with shaded relief and accepts SD cards for all your outdoor activities on land or water. Just take your pick from Garmin’s preprogrammed SD cards including street maps, topographic maps, coastal charts or inland lake data. The card slot is located inside the waterproof battery compartment, so you don't have to worry about getting it wet. Share Wirelessly With Colorado 300 you can share your waypoints, tracks, routes and geocaches wirelessly with other Colorado users. Now you can send your favorite hike to your buddy to enjoy or the location of a cache to find. Sharing data is easy. Just select “send” to transfer your information to other Colorado units. Rock on. Find Fun Intuitive and fun, Colorado features a Rock ‘n Roller™ input wheel for easy one-handed operation and supports Geocaching.com GPX files for downloading geocaches and detail straight to your unit. Customize Colorado's interface based on your favorite activity. Even show off photos of your excursions with its picture viewer. Slim, lightweight and waterproof, Colorado is the perfect companion for all your outdoor pursuits. Keep Your Fix With its high-sensitivity, WAAS-enabled GPS receiver, Colorado 300 locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons. The advantage is clear — whether you’re in deep woods or just near tall buildings and trees, you can count on Colorado to help you find your way when you need it the most. Get Your Bearings Colorado 300 has a built-in electronic compass that provides bearing information even while you're standing still, and its barometric altimeter tracks changes in pressure to pinpoint your precise altitude. You can even use the altimeter to plot barometric pressure over time, which can help you keep an eye on changing weather conditions. Physical & Performance: Unit dimensions, WxHxD: 2.4" x 5.5" x 1.4" (6.0 x 13.9 x 3.5 cm) Display size, WxH: 1.53"W x 2.55"H (3.8 x 6.3 cm); 3" diag (7.6 cm) Display resolution, WxH: 240 x 400 pixels Display type: Transflective color TFT Weight: 7.3 oz (206.9 g) with batteries Battery: 2 AA or 2 NiMH batteries (not included) Battery life: 15 hours Waterproof: yes (IPX7) Floats: no High-sensitivity receiver: yes PC interface: USB RoHS version available: yes Maps & Memory: Basemap: yes Preloaded maps: no Ability to add maps: yes Built-in memory: 384 MB Accepts data cards: SD card (not included) Waypoints/favorites/locations: 1000 Routes: 50 Track log: 10,000 points, 20 saved tracks Features: Automatic routing (turn by turn routing on roads): yes (with optional mapping for detailed roads) Electronic compass: yes Barometric altimeter: yes Geocaching mode: yes (paperless) Outdoor GPS games: yes Hunt/fish calendar: yes Sun and moon information: yes Tide tables: yes Area calculation: yes Custom POIs (ability to add additional points of interest): yes Unit-to-unit transfer (shares data wirelessly with similar units): yes Picture viewer: yes