Are mobile phones allowed?

Yes, A mobile phone is great for use in emergencies and should be kept safely wrapped in a plastic bag in your rucksack or an inside pocket. We are aware that many smartphones have mapping and GPS capability. USE OF THE GPS NAVIGATION FUNCTION IS NOT ALLOWED. In general, the use of the 3/4G based map navigation is too slow, intermittent and inaccurate in the Mournes to be relied upon.