I don't have a lot of electronics on my Road King and don't use a GPS on the bike, but my Butler Maps have earned a permanent place in my saddle bags.
These waterproof maps are available for every state and highlight some of the best motorcycle roads with yellow. I have to admit that I've discovered some very fun rides by following the advice of these maps—and make a point when I'm going somewhere new to check out any new roads I might not have been on before.
Regardless of where you're riding, there's a map. They also have maps for off road riding for the off-road riders out there.
Butler identifies the best rides by highlighting them in yellow and the rides you can't pass up are in red. I've been on just about every rideable road in Utah and agree with Butler's assessment of the rides you just can't miss. The highlighted section described on the map below is part of the ride I describe in the Backyard Tour blog post.