Certainly possible if you read my posts on GPS Review Forums. I've been run leader in my group for years on my A10SR and my girder fork Empire Star. Various satnavs have functioned to varying degrees of success but none have failed.
You need a stable and bold font info display available on the unit as you head is not close to the screen and it must be sunlight readable which will also limit your choice.
I am limited by 6v supply and a dislike of leads hanging around the bike so long battery life is essential to me.
I've tried a 'rugged' smart phone and did not like it.
Weapon of choice at present is a Garmin Montana 680T, running on the best Eneloop rechargeables lasts a good six hours, though I think the older 650 had a slightly better display. Garmin 276CX is newer and looks brilliant but performance on mine was cr@p and I sent it back.
The next problem you'll hit is maps. garmin citynav maps are fine but little detail.
I use free OSM maps but most will route you down footpaths and over styles occasionally,
http://garmin.openstreetmap.nl/ are my favourites here. They have far more detail than citynav maps but you have to get used to the foibles of the routing choices even on shortest, point to point car is best, pretty ride motorcycle is best.
I think that a satnav is an essential part of my enjoyment as do my group for quiet country lane riding because the
satnav takes you down lanes that you do not know and thus would not choose them!