The cache is not at the given coordinates.
The coordinates are for the recommended parking area.
This should be a nice easy “extra” cache as a reward for
the
time and effort required to get to "Mittenfu Stanes"
You will find the coordinates of the bonus cache in the log
book
of “Mittenfu Stanes”, or on the underside of the lid of the
cache
box.
Haqre ynetr syng fgbar.