I have a Garmin GPSMAp 60 CSX and use it on the bicycle, motorcycle, car, and for geocaching. I purchased this magnifier from RAM mounts to help see the screen on the motorcycle (thinks pass real quick on the MC!)
http://www.cabelas.com/cabelas/en/te...equestid=10496
On the bicycle I don't have that issue as much and its easier to move closer to see it. I also purchased some of those stick on bi-focal lens for my sunglasses which help greatly.
Brian