The new Norwegian Epic is to host the annual Macy's 4th of July fireworks display, in a stunning PR coup for Norwegian's latest cruise liner.

The annual display, which is broadcast live to millions across America by NBC, will take place from the decks of the Epic in New York on July 4 at 21:00 EST.

The 120,000-firework display will mark the 400th anniversary of Henry Hudson's voyage down the river that now bears his name, and will feature a soundtrack titled "American River."

"Over the years, Macy's has staged its 4th of July Fireworks in many different locations, but it's my guess that this year's live broadcast, taking place aboard the monumental new Norwegian Epic, will add a dimension to the show that will excite our audience like never before," said Robin Hall, head of Macy's Parade and Entertainment Group.

The annual Macy's firework display, now in its 33rd year, is one of the highest-profile Independence Day events in the US and is likely to provide a significant boost to Norwegian Cruise Lines. The 4,200-passenger Norwegian Epic is set to embark upon her maiden voyage on July 17, having completed her sea trials in February.

As the largest ship in Norwegian's fleet, she will feature 21 dining options from pizza to sushi. Alongside a waterpark, rappelling wall and two bowling alleys, Epic will play host to the well-known Blue Man Group, which will be seen at sea for the first time in the ship's 685-seat theater.

A 285-seat "big-top" circus tent, 280-seat comedy club, 200-seat jazz club and 1,200 square meter casino are also on board Epic. Along with the entertainment options, Norwegian also claims that Epic will have the largest sea-going spa in the world, at 2,883 square meters.

At 153,000 tonnes, the Epic will be one of the largest liners launched this year. P&O's 116,000-tonne Azura launched April 10, while Celebrity Cruises will launch the Celebrity Eclipse on April 25, weighing in at 122,000 tonnes.

All three of the liners, however, will be overshadowed by the November launch of the 220,000-tonne Allure of the Seas, the sister ship of Royal Caribbean's Oasis of the Seas, currently the world's largest cruise liner.