Compass Problems in Quarry? (Pearl Lake, IL)

[jmohns]

I have had issues in Wazee near the Sherwood Forrest area, my compass acted drunk and would make drastic changes even if you only moved a few degrees. It was very aggravating for the newer diver trying to learn how to use the darn thing (me). I purchased the book available at the guard shack and it tells you to not believe your compass in may parts of that mine due to the iron ore content. BUT.... I have dove in Pearl quite a bit and aside from my own inexperience, I have had no issues unless I was next to the sub or such. James