My Quimby's is a 2000, 15 years old...but most of the information for our area, and most of the Gulf Coast is still valid. That along with either the Waterway guide, or Active Captain would do fine. It is like any cruising guide--it will be at least 6 months out of date, because of the publishing delay. This is another reason for "Active Captain!".
One of the reasons no Kindle, is that the Quimby's depends (as many do) on advertising...! So it is different than a book--more like an annual magazine. The old one I have has at least one ad on almost every page.