Step 1: Motivation
I already had a capable PDA that could serve as a host. Getting a GPS receiver that works with it was easy. The main questions remaining:
1. How do I securely attach the PDA to the motorcyle?
2. How do I provide power to the PDA for long trips?
Step 2: Handlebar Mount
I chose a mount that screws into the clutch lever clamp, rather than one that clamps on to the handlebar tube itself. It would also have worked on the brake lever, but I'd rather mess around with my (wire-activated) clutch than my (hydraulic) brakes.
It was a simple matter of removing the bolts holding together the two sides of the clutch mount and bolting the ball attachment in with the supplied bolts and plastic standoffs.
Step 3: Securing the PDA
It turned out that my PDA was a little too thick for the holder to grip properly, especially with a protective skin case on (which is probably why RAM recommends the other). The spring-loaded grippers held pretty well, but I could get them to slip by pulling the PDA pretty hard.
It's hard to imagine the wind or acceleration pulling that hard, but I decided to be extra careful, and cast about for a way to further secure the PDA. Ennui to the rescue! Those trendy bracelets are strong rubber bands that happen to be exactly the right size.
Step 4: Power
My bike didn't come with a cigarette lighter socket for plugging in accessories, so I decided to add one. I got a kit that included the proper socket and a nice in-line fusebox. I attached the kit directly to the battery, hiding the fuse just under the tank, and putting the actual socket in some of the empty space under the bike's seat.
One thing to be aware of: since the lighter socket is wired directly into the battery, it's on even when the bike isn't. Leave something plugged in too long while the bike isn't running, and you may be push-starting your bike.
I got a long, straight charging cable for my PDA and ran it under the fuel tank. I may need to put a small plastic bag over the connector when I leave the bike outside.