World's largest cruise ship is so vast that guests will have to use GPS to find their room
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Entertainment: Thrill seekers can test their mettle on four onboard water slides (left) or those hoping to enjoy a song and dance, can head to the 1,380-seat theatre where they can enjoy shows including Broadway's hit musical Grease and high-flying acrobatics

Such is the scale of the quarter-of-a-mile long Royal Caribbean International ship, when its first 6,000 passengers board in Southampton in May they will be issued with GPS-style wrist trackers so they won’t get lost in her labyrinthine interiors.

And a squad of ‘Royal Genie’ butlers will be at the beck and call of VIP guests. Thrill seekers will be able to choose from four onboard slides, including the Ultimate Abyss, the world’s tallest slide at sea, boasting an impressive 100ft plunge.

Elsewhere, a zipwire will whizz adventurous guests nine decks above the open-air atrium, robots will pour cocktails at a ‘bionic bar’, and passengers can learn to surf on a ship-board wave simulator.

Entertainment includes Broadway’s hit musical, Grease in the full-size theatre, a state-of the-art multimedia ice rink spectacular and high-flying acrobatics.