I don't think there's anything wrong with the lat/lon values that this system provides. For example, if you hover your mouse pointer over West Sister Island, the values should be something in the neighborhood of "lat 41.738867 lon -83.096843." You can convert these values to minutes and seconds by doing the math:

41 = 41 degrees
.73 * 60 = 43.8 minutes
.0088 * 3600 = 31.68 seconds

41 43.8' 31.8" is almost spot on according to my sources. Thanks for sharing this map..