Birch Brother - Coordinates are like gold fillings in your teeth. You only give them to to surviving family once you've passed. And, never trust any you're provided unless you've fished those headings before. Jeffries is most easily accessible from Rockport's Granite Pier. Head out east and go about 8 - 10 miles. You'll be on the ledge's west side. Once you've hit the ledge, learn what fish you'll find at what elevations. For cod and haddock, seek the deepest levels now. In fact, get a chart and head toward Tillies, further east 25 miles or so. Jig in water 250-300' as you drift.
Once you hit fish, do the same drift until its time to try another spot. BUY SOME CHARTS, GET A GPS, and MARK YOUR SUCCESSFUL FAVORITES. Then, when someone else asks you for YOUR GPS marks, you'll know why most most of the answers you'll get will be nicely telling you to go pound sand. If you get successful, and the guys here can tell, they'll eventually ask you for details such as lure color, what type of trolling rigs, lines, depths, etc. Then it will be your turn to rub the salt back into open wounds. Good luck and have fun as you're finding many of your own special holes!