Check out a unique and large carved pole, then project a waypoint to the final cache location.
At the posted coordinats you'll find a tall, tall totem pole. On the back of it, near the base, you'll find the year the pole was carved. Divide the year by 16.2. Project a waypoint from the posted coordinates a distance of that many metres at a direction of that many degress. (Yup, it's the same number of degrees and meters.) that's where you'll find the cache.