Had more of a chance to flip through
War At Sea today. This is definitely the book I've wanted for years. The maps are clear, detailed, easy to read, cleanly rendered, and all are in full color. It doesn't just cover the "major" battles, either. I'm seeing plenty of maps showing minor amphibious operations, German auxiliary cruiser voyages, action in the Black Sea and Baltic, etc.
Can't wait for the WWI atlas, but Amazon is asking $50 for the Naval Institute Press edition, and $36 for the Seaforth edition. Amazon US always has the Seaforth editions available for pre-order before they're published, and never gets them in stock when they're released. Sigh...