My Father in Law has a GPS unit for which he'd like some data. It's a Garmin GPSMAP 172 monochrome chartplotter. He needs the data card with waterways and lights for northern Lake Michigan, Lake Huron between the Mackinac Straits and Detour Village, and the North Channel of Lake Huron. They're all pretty popular with recreational boaters and fishermen and, so, should be available, unless of course he's procrastinated too long. He has a blank data card floating around somewhere but will probably need at least one more. There's a lot of information, and if memory serves correctly it's a 64 mb data card.
Any ideas where he might get such a thing??
Thanks in advance,
Dean