I was 100% satisfied using my iPhone 4 as my full time navigation device on my recent tour. I used the Biologic iPhone Mount and a new trent IMP99D battery. The phone survived the rain and lasted 10+ hours on the road while plugged into the battery. I will definitely use this set up again. The iPhone has to be set up, turning auto brightness off and setting brightness to 100%. I had an analog map just in case but never used it.