Hi All,
Coming across a constant issue with my 820. Running a course via a GPX file runs great, turn by turn works and everything is accurate. Then I generally just select "Back to Start" then "Along Same Route". The unit calculates and we are still all fine. Halfway back, on the exact course, I get "Route Calculation Error" message and the units drops all navigation. It's a consistent thing with this unit, I get a lot of these messages when I'm relying on the unit to calculate a track without a course file selected. Come on, it's version 11 and we are still having issues with a major feature of the unit. This is using GPS, GPS + GLONASS or GPS + GALILEO. Makes no difference.