Looking for Great Lakes chip for Northstar 952x
 

I purchased a SONIC last year from the DC area and it has a Northstar 952X GPS Chart Navigator in it. I assume that this is what the factory put in these boats from new. I have 2 chips that came with it, a Chesapeake North and a Chesapeake Bay chip that I would like to sell or trade for a Great Lakes chip. If anyone can help me out please call me at 231-631-5896.
Thank You
Craig