GARMIN GPSMAP 64 High-sensitivity GPS/GLONASS receiver with quad helix antenna for faster and better positioning performance Garmin’s outdoor-optimized dual battery system allows the use of either a Garmin NiMH battery pack or conventional AA batteries. Built-in internal memory includes 4GB for 64/64s and 8GB for 64st. All models also feature a microSD card slot for additional memory. The 64 series allows storage of a total of 5,000 waypoints 250,000 preloaded worldwide geocaches from Geocaching.com, plus additional storage space and new tools such as advanced filtering and deletion Download a huge number of geocaches to your GPSMAP 64 and find all the information that you need to find the cache on your device – no additional notes needed. Outdoor-optimized, 2.6’’ sunlight-readable 65k color display Button-based user interface for safe operability in most demanding environment Rugged, lightweight, and water resistant (IPX73) Add more maps, such as detailed topographic, marine (BlueChart® g2), and road maps (City Navigator® NT). You can also download BirdsEye Select maps and Garmin Custom Maps directly on your handheld