The Glyder plateau is a nightmare in heavy mist, as are the neighbouring Carneddau, but in a different way.
Ive marshalled on top of Glyder Fawr on several occasions, for both the 1000m and Peris Horseshoe, navigation when one has lost ones bearings, is very challenging on terrain that looks the same.
The huge boulder field that makes up the Glyders, is not the easiest to navigate, even in good visibility, but i know what its like up there in very poor visibility, every bit of terrain looks the same, and some of those boulders are B I G.
Trying to hold ones composure and not to panic, is easier said than done, its happened to me once or twice, a big event happened in the Carneddau some years ago.
I was soaking wet, getting terribly cold, and totally unsure of my bearings, somewhere between Foel Fras and Yr Aryg, i thought, but i was only a a few yards from Foel Grach, and continuing towards lewellyns summit, totally in the wrong direction.
How i found my bearings i cannot remember, but i was parked at Aber, and several hours overdue, i made it back safe.
Everytime i visit the Glyders, i have to be 100% sure of the weather conditions, call me a sissy, or what ever you like, but i only venture near the Glyder plateau, in fine settled weather, when there is a limited report of any adverse weather.
The Glyders and Carneddau are high mountains, and need the utmost respect.
I know its not easy for those living a greater distance from the mountains, but if the weather looks poor, have a backup walk in reserve.
A trip out into the mountains is meant to be enjoyed, and if one leaves for home still trembling with fear, of what might have been, then its a day one would rather forget.
Ive been lost in the Carneddau a few times, and realised that if i headed due North by using my compass bearing, eventually after an eternity, i should be in the area towards Foel Fras.
Their a lot easier to navigate, due to their terrain, and being made up of mostly grass.
Thankfully none of the terrain of the Northern Carneddau, offers any technical problems, and unlike the Glyders, if you stumble, most of the time the landing will be a soft one.
All i hope is that you found your way down safely, and learnt by your trial and error.
Keep studying the weather, throughout the the duration of your trip in the mountains, if dark clouds or mist is approaching the Glyders, make a hasty detour to safety.