I'm  considering a unit for my Rocker, any thoughts on what's the best available? I suppose they fit on anything with the right bracket mounting hardware and cig lighter?  I want to be able to fit it to my Yorky Sporty as well. 

hi, a bit too modern for us older bike's , i enjoy getting lost  you have a longer ride

most smart phones you can install either tom tom or garmin software. If you know someone tech savy enough, you might even be able to get it for nix. That said, on iphone through apstore its only $80. Keep it in your pocket, and only use it when needed.

 doe's a sat nav only work  1 day a week ?