Two Easier Ways to Tote A Cruise Guide Onboard For 28 years, Berlitz's Complete Guide to Cruising and Cruise Ships, with in-depth reviews of 284 ships by Douglas Ward, has been a bible to perennial cruisers. But the 700-page guide is also the length of one. For travelers who want to take Mr. Ward's trenchant advice out to sea with them, Berlitz has published an e-book of the guide and improved its mobile app, which was scheduled for release today. The app also features a filter function that allows users to choose cruises according to accommodations, food preferences and entertainment options, and determine which ships offer the best value. "The book is a planning tool, and it's all about choosing the right ship," said Alex Knights, digital publishing manager for Berlitz. You want to get to the right bit of information as quickly as possible, and apps work really well for that. Though the app will provide links to cruise line Web sites, it will not allow booking, a decision that is meant to uphold the line between opinion and endorsement, Mr. Knights said. To trust Douglas Ward's authority, we have to remain objective.