My advice it not to get the basic model. Get a model that has an SD card, so you can have maps of large areas. A friend says he has all of Canada on his.
Mine does not have the SD card, and will hold only small areas of the maps.
Also a computer hook up, so you can download software updates, and work with your maps on your PC.
For example, I uploaded all my GPS moose camp trails/waypoints to google earth, then printed them off for the guys. We've never had the trails marked on a map before, and it has proven itself very handy.
You can also print off topographic maps that you can buy for your GPS with your trails/waypoints on them.
The Rhino model mentioned above includes a GMRS/FMRS radio, and can be used to transmit your position to another with the same GPS. It would show your position on his map when you transmit.
Some models come with maps, some don't. Mine didn't, and I bought TopoCanada on CD for it.
The basic model works, I used one for a number of years, but the maps make it a hundred times better, well worth the extra coin.