There's a lengthy but helpful GPS thread on the forum. After wading through I went with an Extrex 20 because it takes AA batteries (good for longer trips) and it works fine for cycling as long as you remember to look at it. I took a dozen other riders (strangers) on a 5km detour on the Cambridge 100 because I was concentrating too hard on staying upright on a very spinny downhill and didn't notice the turning.
There's a lengthy but helpful GPS thread on the forum. After wading through I went with an Extrex 20 because it takes AA batteries (good for longer trips) and it works fine for cycling as long as you remember to look at it. I took a dozen other riders (strangers) on a 5km detour on the Cambridge 100 because I was concentrating too hard on staying upright on a very spinny downhill and didn't notice the turning.