‘Garmin’ Support Provides Insights Into ‘UltraTrac’ GPS Mode.
They were responding to THIS post.
What it says about ‘UltraTrac’ in the
Fenix 5 Plus Owner’s Manual.
Click image to ENLARGE.
There is NO mention in the Owner’s Manual about pre-calibrating or that it is designed for longer than marathon distances.
I triple checked.
Plus, I have used GPS on this ‘course’ at least 100 times!
The problem, as I see it, is the same as that with open water swimming. The gyro dead reckoning is dead wrong.
Here is my response to Garmin.