The UESP Wiki states that the fifth way point is
The fifth and final wayshrine, the Wayshrine of Radiance, can only be reached after a long, arduous trek through Forgotten Vale and Glacial Crevice.
My position's direction and the map marker directions are conflicting. I am waiting at the 4th wayshrine as of now. Clairvoyance has been no help.
How do I reach the Glacial Crevice?