A staple among outdoor enthusiasts, the Garmin eTrex Summit HC features a high-sensitivity GPS receiver for peak performance in any environment and includes 24 megabytes (MB) of internal memory, a detailed basemap, crisp color screen, barometric altimeter and electronic compass. With its high-sensitivity, WAAS-enabled GPS receiver, eTrex Summit HC locates your position quickly and precisely and maintains its GPS location even in heavy cover and deep canyons. The advantage is clear - If you're in deep woods or just near tall buildings and trees, you can count on Summit HC to help you find your way when you necessity it the most.