I use the etrex venture and love it. Right now it sits on the stoker handlebar of our tandem. Great way to give speed, distance and other info to my wife without running wires to the back wheel.

And since these things are ment to be in boats they are pretty tough and water tight.

I also use topo software to map out "stuff".

What topo software do you use bike COLORADO?

-clint
www.activebody.org