Magellan 5310 with a "bean bag" mount. Set it on the tunnel. Biggest problem with it is that during the day the glare from the sun can make it difficult to read and it's difficult to hear over the pipes and road noise. I pretty much memorize the directions after the course is plotted. I carry maps, but they can be really difficult to read when driving and who wants to stop to read a map. The whole point of taking the Cobra in the first place is to drive it not sit on the side of the road reading!
