Well, even if I add 171d59.1min to 171 degrees east, I come to 8d0.9min West. At 40 degrees North you are near the town of Trinhao ("a" with a swirly wave thingy on top of it) Other than an (olive?) plantation or some other sort of tree farm, I don't see what's so special about it.
If you subtract 171d.59.1min from 171 degrees east, I come to 0d59.1min West. Or 0d59min6sec west, which is a sparse forrest 3.5km southwest of a town called Torrijas, Spain. There are peculiar empty strips of land in between the trees.
Without clearer indication of what the coordinates are I can't help further. Also how close are you supposed to get with your answer? At 40 degrees north 1 minute of longitude is 1.4 km long!
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