The Garmin GPSMAP 78 gives you top-notch performance in an easy to use package. This handheld unit comes standard with a worldwide basemap and can easily be fitted with additional maps (not included) via download or MicroSD card. 1.7 GB of internal memory provides plenty of space for file downloads and with photo navigation, you can easily download an image from the Internet and navigate to that exact spot. Featuring 2000 waypoint capability, marking favorite spots just became much easier. The GPSMAP 78 is paperless Geocaching and custom map friendly and supports BirdsEye satellite imagery (subscription required). Geocaching just got a lot easier as well, with paperless caching. This allows you to have up to the minute information such as location, terrain, difficulty, hints and descriptions. Gone are the days of manually typing in coordinates and printouts. You'll never have to worry about wet weather ruining your unit. With its weatherproof design, the GPSMAP 78 will stay dry and functional, is submersible to 1 meter for 30 minutes and floats. The GPSMAP 78is best powered by lithium AA batteries and features a runtime of up to 20 hours. The GPSMAP 78 is also compatible with City Navigator software for auto-routing navigation. This handy little unit also features hunt/fish calendars, tide tables, and sun/moon information, to give you the best data for your hikes, hunts and fishing trips. The WAAS-enabled GPS receiver and HotFix satellite prediction ensure maximum reception for up to date and accurate navigation and marking of favorites. The GPSMAP 78 can also be connected to a computer with Internet to connect to Garmin Connect. This handy feature allows you to track your activities and routes and share via Facebook and Twitter.