Used RWGPS iPhone app. Needs lots of work. Completed 80+ miles and calc of speed, distance, etc just using GPS seem to have lots of issues. Turn-by-turn directions are great except as I neared intersections it kept telling me to turn left or right even though I need to continur straight. The pre-warning about a turn getting close was usually correct. It is also very clumsy with other stuff interrupting - phone calls, text messages, etc coming in on the phone when the app is running in the foreground. It doesn't handle popping to the background and returning to the foreground well at the completion of te phone call or other "interruptions". I like it, but it still needs lots of work. Here I started in Whitehouse, Ohio and rode to Brighton, Michigan and on the phone it seemed to still be showing the entire ride but apparently only uploaded half. Very annoying. Created a manual trip to capture the actual distance and route I created so this 42.8 miles is part of that 83 mile trip.