What are the best portable navigation units? What have been your good and bad experiences? Which one would you recommend?  

i use a magellan but i want to try out one of those garmin geko's because they should get the job done and they are much more inexpensive. so if you run it over, mash it in the mud, drop it in the rocks, or freeze it in the snow and you break it.. it's not that big of a loss  

are you just real clumsy, or do you just play real rough?