Recently I bought the Garmin Edge 705 to track my training. I wanted a GPS unit that I could use running, cycling and also in my car. The 705 is slightly larger than a cellphone and is extremely light (less than a cellphone). It mounts to the handlebars of your bike or you can purchase a car kit to mount it there as well.
So I came up with this crazy idea a few months ago that I wanted to do something that took a lot of will and was something that not a lot of people have done before. A friend of mine kayaked 500 miles down the Missouri River and while I am planning on doing that as well (or something similar), I wanted to do something a little bigger and a little more ambitious.