the main reason for having one of these things (for me) is to have up to date phone numbers etc. I found the one year old one I had for Lake Ontario to have significant aging problems in some areas. And the 5 year old guide to Newfoundland (things don't change there much, either) had very significant discrepancies - like the thriving village of 500 people we went to that was no longer there! Same thing in Nova Scotia, docks and moorings disappeared, etc. So when I figure that the 2010 version actually contains 2009 information, I ask the question.....