Is there a way to calibrate the app? I ask because I seem to get varying degrees of inaccurate distances on the app when compared to my Apple Watch. Some days the two pretty much line up, other days I've seen anywhere from a tenth to fourths of a mile difference, but this past weekend I had a huge difference. My watch recorded 8.6 miles, but Hiking Project recorded 11.2 miles. My watch recordings are closer to the posted/published trail distances, so I'm lean toward it's the Hiking Project that is off. Is there a way to calibrate or any other suggestions?