Following this mornings Irish route sailing, she resumed on her regular Douglas-Heysham route and she also serves Douglas-Birkenhead (Liverpool) during the winter months.

During the summer Dublin-Douglas sailings are served by fast-ferry catamaran Manannan (1998/5,743grt). The 96m InCAT built in Hobart,Tasmania had also operated Douglas-Belfast high-season crossings. Her roster is now confined to a Douglas-Liverpool sailing schedule.

Ben-My-Chree (photo) is Manx for 'Girl of my heart' and her island owners commissioned the 12,504grt ro-pax from Dutch shipbuilders Van de Giessen-de Noord. The 125m ferry was launched in 1998 and she can accommodate 630 passengers,275 vehicles and 1,235 freight lane-metres.

This particular ro-pax design has also been built for Channel Islands operator Commodore Ferries with their Commodore Clipper and a Scandinavian ferry operator. In addition another Dutch shipbuilder, Merwede built a multi-support vessel (MRV) derived from the design of Ben-My-Chree for the Royal New Zealand Navy when they commissioned HMNZS Canterbury (L421). Click for similar port-side photo view to compare differences.

Incidentally the Manannan prior to entering service last year for the IOMSPCo. was for five years chartered initially to the United States Navy but transferred to the United States Army Forces. To read more click HERE.

On board the open-topped yellow tour-boat RIB, an audio commentary firstly informs you about the M.V. Cill Airne, built nearby in the old Liffey Dockyard, nearly fifty year ago. Discover why she was one of the last riveted built vessels in Europe, her days as liner-tender and the rich and famous who threaded her decks.

Heading downstream the former lightship Kittiwake is berthed opposite the O2 Arena. She was one of the last lightships to serve in Irish waters at the South Rock station off Co. Down. In complete contrast a ferris-wheel revolves in the background but no sooner the boat slips under the East-Link Toll-Lift bridge which opened in 1984.

On the other side of the bridge a small non-descript looking grey-hulled motorboat lies at anchor, on her bow is painted the figure 11. So what's the story here!...here's a glue: 'Don't pay the ferry man until you get to the other side!...

Past Poolbeg Marina, giant blue-gantries cranes of the Marine Terminal Ltd (MTL) are busy unloading from Karin Schepers, a containership previously reported on Afloat.ie. Look out for the ports  'graffiti', the work of crews who make their mark by painting the name of their ship and also the mural of the late Ronnie Drew of The Dubliners.

Opposite this terminal is the ports largest basin, Alexandra Basin, named after Queen Alexandra. Subject to port security, the tour may include entering the basin should there be a particular vessel of note.This also allows for views of the dock-gates of the Dublin Graving Dock, one of only three large ship-repair facilities on the island of Ireland. Neighbouring the graving dock is where the Liffey Dockyard once stood.

Before the tour passes the towering twin stacks of the former ESB Poolbeg electricity power station is tucked away Pigeon Harbour. Learn more about its hotel conveniently sited beside where packet-ships regularly plied, essentially the ferryport of its day. Its modern-day counterpart faces opposite on the north quays where up to 17 sailings daily operate on the Irish Sea.

Marvel at the length of the impressive Great South Wall, why was it called 'Great' and why was it built?... What can be revealed is that Captain William Bligh of "Mutiny of the Bounty" fame was a major figure in the project, when the wall was completed in 1795.

The commentary has many more fascinating facts, figures and the occasional anecdote told with typical Dublin wit. So if you live within 80km (50-mile) radius of the capital, then the chances that the shirt you wear, the breakfast cereal you ate and the car you drive, most likely came through Dublin Port as almost 75% of goods serve this hinterland.

More on Dublin Bay here