Is the 24 hour visa-free transit permit available to cruise passengers?

Apparently a new rule was in place since July 2013 that China 24-hour transit free policy now include ship and train (air only in the past). As long as you arrive and leave the same port within 24 hours by air/ship/train to a 3rd country you do not need an entry permit. Can someone confirm the new ruling?

We are booked on a cruise that will stop in Shanghai (Baoshan) for 1 day, from 6am to 10pm, less than 24 hrs. We will be coming from Nagasaki, Japan and cruising to our next port of call, Okinawa, Japan. Is the 24 hour free transit permit available to cruise passengers who wants to do a day tour?