(10:23 a.m. EDT) -- Royal Caribbean's Anthem of the Seas could be based out of Southampton when it comes into service in 2015.

The ship is listed as making six port calls to Le Havre in April and May 2015 and then again in August and October -- with the start and end destination being Southampton. Other stops include Bilbao, in Spain and Zeebrugge, in Belgium.

The itineraries exactly mirror that of Royal's Southampton-based Independence of the Seas, fuelling speculation that the new 158,000-ton, 4,100-passenger ship could replace Independence in the U.K.

The story first came to light on the Cruise Critic Message Boards when celebrity_fan wrote: “Anthem is listed for Le Havre in 2015!!”

Beardedladies replied: "Very interesting! Looks like three or so short 3 or 4 day trips from Southampton at the end of April and beginning of May 2015 to me, then a return in August and October means Anthem isn't going far. That pretty much seals it - Southampton will be the home port I think."

Members are also speculating that Independence could replace Liberty of the Seas out of Barcelona:

DEIx15x8 added: "If you compare the Independence of the Seas' dates in 2014 with those of the Anthem in 2015 they show an identical pattern. Looks like Anthem will replace Independence. Now the question is if Indy will head west in November 2014 and not return or shift somewhere else. Maybe she is Barcelona bound now."

There is also talk that Serenade of the Seas could replace Legend of the Seas.

Celebrity_fan writes: "Serenade sails the 12-night-med-cruises until fall 2014 and some Caribbean cruises in winter until spring 2015. After that she seems to depart from Copenhagen and Stockholm, as well as Hamburg in summer 2015."

And nickthecruiser writes: "So if this is true then Serenade in 2015 is taking over the itineraries that the Legend is doing in '14."

The schedule also lists Serenade of the Seas as making a call into Le Havre from Zeebrugge destined for Southampton in May 2015.

However, at this stage it is all just speculation -- Royal Caribbean would only release this statement: "We have not yet confirmed Anthem of the Seas' deployment." -- by Adam Coulter, U.K. Editor