I have used a copy of Exploring Puget Sound and British Columbia for 30 years. As my vessels grew larger and my original became worn from years of use, I purchased a second copy. This is so valuable in planning cruses that I needed another yet for home reference. Now I have three copies. It is invaluable and while they say not to use this for navigational purposes, it is a legal disclaimer and yet the charts are extremely accurate as indicated in my GPS units aboard. I would highly recommend this to anyone exploring these waters. The chart book is of a size that you can use it at the helm rather than having to put a large chart on a table. I love this book!