The Absolute Best Elevation Tracking App & Apple/Pebble Watches Are Supported!!!! Awesome App and worth every penny I paid for it!!!!! I have eustation tube dysfunction, which means that the tube that connects your inner ear to the back of your throat is narrow and/or blocked, and when you change elevation you cannot get your ears to “Pop” and equalize the pressure and so when you’re going up/down a mountain the air in your ears expands or compresses respectively based on the atmospheric pressure of your starting point vs your destination and can cause mild discomfort to excruciating pain. I use this every single time that I have to drive up or down some mountains and when I’m done driving I love to see the elevation histogram to see how much I went up, down and the overall elevation change. This helps me to keep track of how the pressure changes and gives me a better understanding of why my ears hurt as much or as little as they do.