Yeah mate,,
There are quite a few threads on here about GPS units, pros & cons etc etc
You will find it hard to go past Garmin 60 or the newer 62 series units
A lot of us run the 60CSX or 62`s on the 2 day navigation rides as well as normal day trips.
Very easy to use, wide range of mount options, hardwire kits, software & great maps 
TB has all the knowledge, as he has about a dozen units of different models :laugh: And he uses them to great advantage.
That`s exactly what he is doing right now for the weekend, mapping out next weeks route :woohoo:
Have a gander thru this lot until he chimes in to help out,, he will, he can`t help himself 
http://www.obtrailriders.com/index.php/forum?view=category&catid=77
Cheers