Join Date: May 2002
Bikes: 2010 Cervelo RS. Marinoni touring bike. Kona Tanuki MTB. Specialized Hardrock (commuter). Raleigh (early 80s) Super Gran Prix.
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I am a surveyor/cartographer and use them regularly for my work.
Beleive it or not I do not own one, not do I use one on my mtb bike. I walk regularly in the woods and would prefer to use map and compass, I find it more fun and challenging.
However, I taught my father how to use his for his boat and whenever we go out for a spin we would use it - just for fun and for my father to get more use to it.
There are many differant types, sizes, and bells and whistles you can get on them. From the simple $130 Walmart brand to $2000+ systems that you can display maps, make waypoints, and download files to plot tracks later.
It depends on what you want to use it for, and mapping trails on bike would sure be fun. I do recommend some things; at least a 12 channel riecever, the ability to remove the antennea (sp) for a remote, mounting system, waterproof (hey it IS used outdoors), upload and download capability to your computer, and WAAS capability (if your in the States) or CCG differential ability if your in Canada (works on coast only).
After that they get kinda big to strap onto a bike.