I know that some of us have used a phone for navigation and daylight visibility of the screen can be a problem. The GPS bicycle computers are mostly built for the race crowd and training. The battery life stinks for the price. The color E ink phones are daylight visible and use very little energy so the battery will last much longer. These phones run on Android and the memory card capacity is 1 terabyte on several of them. I'm considering the Bigme E ink Smartphone Hibreak . This is for Navigation and book reading and its a phone also. Have any of you used an E ink phone and what are your thoughts on doing so.