It's the must-have accessory for fans heading to Punchestown this weekend.
Remember staggering around the fields for hours looking for your tent, and your friends, only to look out in to a sea of canvas?
Well those days are gone thanks to a new iPhone App which will help you find your way to your temporary home at this weekend's Oxegen.
The new application has gone straight to the top of the iTunes App Chart, and it works by simply holding your iPhone up and looking through the viewfinder which will highlight bars, stages, toilets -- and even your tent, through the GPS system.
Through your iPhone you will be able to create personal line-up schedules, receive up-to-the-minute alerts and instant access to tweets about how gigs are going at the other side of the site.
The app is available from iTunes.
The festival kicks off on Friday and will feature Jay-Z, Eminem, Black Eyed Peas and Florence and the Machine.
Some 70,000 music fans will attend to watch another 150 artists on six stages.