The North coordinates can be found by working your way through some of the protections placed on the Sorcerer's Stone:
Now only Severus Snape's potion test stands between you and your victory over the West. A lot of the greatest wizards haven't got an ounce of logic, they'd be stuck in here forever. Perhaps you will do better?
Danger lies before you, while safety lies behind. Two of us will help you, whichever you would find. One among us seven will let you move ahead, another will transport the drinker back instead. Two among our number hold only nettle wine. Three of us are killers, waiting hidden in line. Choose, unless you wish to stay here forevermore. To help you in your choice, we give you these clues four: First, however slyly the poison tries to hide, you will always find some on nettle wine's left side; Second, different are those who stand at either end, but if you would move onward, neither is your friend; Third, as you see clearly, all are different size, neither dwarf nor giant holds death in their insides; Fourth, the second left and the second on the right are twins once you taste them, though different at first sight.
They stepped over the threshold, and immediately a fire sprang up behind them in the doorway. It wasn't ordinary fire either; it was purple. At the same instant, black flames shot up in the doorway leading onward. They were trapped.
The following puzzle caches must be solved and found to complete this series:
GC1ZD5V GC1ZD5X GC1ZD60 GC1ZD64
GC1ZD67 GC1ZD6A GC1ZD6D GC1ZD6H
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