1.  Ship time may be different from shore time. 

As ships sail though different time zones, they usually adjust their official onboard clocks to match the time in port — but not always, since it’s at the discretion of the cruise line. 

As a result, it could be 2 pm on the ship’s clocks and 3 pm in port.  Make sure you know the observed time before venturing onshore so you don’t miss the ship when it sails away — or precious time in port.