Just wanted to add a quick write up on visibility in the mountains.
Based in the Mourne mountains, I'm glad to say that we do have a great mountain range for every one to enjoy and I definitely would not like to come across preachy or discouraging, as a matter a fact I want more people to be able to go and enjoy the outdoors.
The Mournes aren't an Alpine range and don't go to staggering, altitude sickness heights, however for this very reason they should not be underestimated.
Walkers don't fall from dizzying heights and get injured or die, it's low cloud, bad visibility and underestimating day light hours that are the dangers here. Even the Army had to be rescued recently because of this type of situation, however they also were tied down with small injuries of their walking groups which forced them to wait for help in weather exposed areas.
In one of my recent walks I managed to get some very good shots of how visibility can change very quickly and put you in a tight spot.
Low visibility is when your navigation needs to accurate, with GPS or map and compass. I have always preferred and use Map & compass, however will still have a back up GPS in my first aid kit, I'm not saying you have to be an expert navigator, but you should work with your limits and stay safe.
Take a guide or someone who has experience, learn as you go and practice. When walkers are lost, they then get into other problems, because this is how it goes, it's a snow ball effect, a massive tragedy happens with lots of small things going wrong and leading up to an incident. You can eliminate certain aspects of this, with just a little bit of prep, if your lost, your not necessarily far off from being found, but you might need to spend a bit more time in the mountains than you expected.
For this reason you should always take kit with for this type event (check our kitlists), some extra layers, waterproofs, headtorch, extra food/water, FA kit, cylums are always a good idea (glow in dark stick), gloves, warm headgear, emergency bivvy or shelter and obviously your phone. All this stuff can be picked up quite reasonable and then you can make your kit more extensive as you go.
A great bit of kit is also the GPS spot which I would recommend adding to your kit at some point: