The United States Powerboat Show in Annapolis is always a popular show – for a whole lot of reasons. It’s fun, it’s easy to get to, and it’s easy to see a lot of new boats and gear there. And it’s in Annapolis, the hub of the Chesapeake, a cruising mecca with boatyards and marinas – and waterfront restaurants and bars – all around. Centered around City Dock, in the middle of town (also known as Ego Alley), this year the show, the 47th annual, runs from Thursday, Oct. 11, through Sunday, Oct. 14. It has many more boats than ever…