On some ships and some cruises, people have been able to get a printed "mini-Navigator" from Guest Services or from their cabin steward that lists the day's activities and locations. Information about shop and food service hours, future activities, port all-aboard times, and so on is on the Navigator app.
Just to clarify: The onboard Navigator app is the same app as the pre-cruise Disney Cruise app where you can book and view activities. Once you are at the cruise terminal or onboard, you can log into the "onboard" version using your name, stateroom number, and birthdate. This does not require a Disney web account and password. Everyone in your cabin can access it as long as they download the app to their device before the ship sails (that is, while they have access to WiFi).