As far as I know the only option you will have is the Garmin G2 chart. The older units will not run the Lake Vu mapping. The G2 will cover all the Great Lakes/St Lawrence. For the northern lakes you can go with a topo map which will provide shoreline detail but no hydrographic info.
Navionics also has some charting available that may work with your unit. Email me directly for some more info.
-Lawren
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