Has anyone else tried using a gps while sailing a C14? I bought an e-trex and used it last time I was out. It worked really good for boat speed. I could tell pretty quick when I made sail adjustments wheather it helped or hurt my speed. Mine is waterproof (but not bouyant!) and has a little sling so you can hang it around your neck and runs something like 20 hours on 2 AA batteries. It can also tell you distance traveled and a bunch of other stuff I haven't even tried yet.