The Garmin GPSMAP 60CSx adds several performance-enhancing features to the popular 60-series products, including a removable microSD card, high-sensitivity GPS receiver, barometric altimeter and electronic compass. The 60CSx comes with a blank 64 megabyte (MB) microSD card, so you can store extra maps from optional MapSource mapping software. Just connect to your computer with the USB cable, and you can load map data or transfer routes and waypoints. You can even purchase microSD cards that are preloaded with MapSource maps, which means you don't have to connect to your computer. The microSD card slot is located inside the waterproof battery compartment, so you never have to worry about water getting inside.
One tough GPS.....
There are several good GPS manufacturers, and many models on the market today. I've owned this GPS for several years now, it's an incredible device. Homes in quickly, "burns" through forest canopy (even the roof of my house), have accidentally run over it with my road bike, dropped it in the lake, you name it, I've done it. And it keeps working. I have the Topo USA (1:100,000 scale) DVD, it's invaluable to me as a wilderness "tripper" (canoe, kayak, backpack). You can't go wrong with this GPS.