I know a lot of people use smart phone and there are thousands of different App's for them. So my question would be what is the best app that you use on your smart phone? One of my favorite apps if "Fuel Log" you enter in how much gas you put in at the pump and your mileage, it will keep track of your MPG and show you how many miles you have gotten per tank, when you filled up, how much it cost to fill up etc... Pretty cool app to have. Another would be "CoPilot live USA" I Use my phone as a GPS unit, mounted right on the handlebars this app works the same as a Garmin or Tom Tom. Just thought I would throw this out there and see if someone else has any bike related apps that they use.