By the way, I forgot to be totally health and safety by adding this (although I often ridicule H&S, this is a problem the mountain rescue teams have to deal with on a weekly basis):-

Please don't rely on GPS or mobile phone map apps, as so many rescues result from people getting duff info from them, as they have proven time after time to be very inaccurate in the mountains. The possession of the appropriate map and a compass, not to mention the knowledge and ability to use them, are essential to contributing to a safe day on or amongst the mountains. Do not trust your toys, as they do bite! Call me a Luddite, I don't care.