Lost Turn by Turn. Incorrect distance to go. Navigating a course.
Garmin
When following a track (TCX or GPX) I quite often get a problem where the 820.
a) Stops providing Turn by Turn.
b) Gives an apparently random distance to go (to complete the course). Often longer than the course.
c) stoping and restarting the course has been known to fix it on rare occasions. But usually the turn by turn is wrong (some random next turn either near the beginning or the end). The distance to go may correct temporarily after a restart but will at sone point become incorrect.
Usually my routes are between 50 & 100 miles. The end is usually near the start (within 500yds). They sometimes cross themselves.
The garmin going wrong is usually triggered by either going off course or by being turned off or going in to sleep mode when I stop for coffee.
If I ride the same route twice it won't necessarily fail in the same place.
This is a real problem when I'm in a strange area.
Nick
PS - a friend has the same problem on his edge 1000