I have been experiencing some problems navigating using courses on 5X. I find that when navigating the watch has a hard time starting navigation from any point along the course and gives the distance to the beginning of the course. In some cases it eventually realizes I am on the course and begins navigation. Yesterday while navigating a course on a mountain I stopped for lunch and used the "resume later" option. When I started the app to continue the course the GPS would only state the distance to the beginning of the course even though as I continued my hike it would highlight the active course in magenta and show my position along it. I had to continue the rest of my hike without any useful navigation information and merely following my position graphically along the course.
I did not have this issue in the earlier firmware versions either starting a course mid way or resuming after a stop. Has anyone else come across this? Anything I can do to address this? Basically for now I am afraid to stop the app when taking a break as the navigation does not resume properly upon re-start of the app.