This may not change things for you but I thought I’d share this news in case you were not aware. Navionics changed their coverage areas for 2007 and they are now even larger areas than in years past. Navionics Gold XL9 Coverage Areas
If you fish other Great Lakes waters, LOTW, Rainy, or rivers that are covered, the chip may be worth picking up. If not, it would be beneficial to rent one.