By Angela Barnes, Sky News Reporter
Hill walkers and climbers are being warned to plan their winter adventures properly, as mountain rescue teams warn their workload is becoming unsustainable.
In Snowdonia, Wales, the Llanberis Mountain Rescue Team has become the UK's busiest after attending a record-breaking 200 incidents so far this year.
They have also seen a 400% increase in the number of reported incidents over the past decade.
The majority of call-outs were for lower leg injuries or for "people too tired to continue".
Rob Johnson from the Llanberis Mountain Rescue team told Sky News many of the incidents could have been avoided if a few basic safety precautions had been taken.
"The vast majority of rescues are where people have not got the experience or equipment they need.
"A classic example is where people don't have a map, a compass and they can't navigate.
"They arrive assuming that it is Snowdon, there will be lots of people to follow, it will be well marked paths.
"Low down that is true but, as you get higher, the paths get a little more vague and the weather changes very quickly and we are regularly going out to rescue people who, had they had a map and a compass or the ability to navigate, they would not have needed our help in the first place."
At other peaks, such as Ben Nevis in Scotland, guides and mountain rescue teams say they are also seeing more tourists taking on challenging peaks without training or knowledge of the area.
But in Snowdon, the Llanberis team said their workload is unsustainable and they want to see a bigger national effort to inform visitors before they venture into the mountains.
They want to stop people thinking that there will always be a rescue team around to help.
Winter skills instructor Sam Leary from the British Mountaineering Council said the mountains in winter are wonderful but people can underestimate how ferocious they can be.
"I think society is more risk averse. And because some people are not used to making dynamic risk assessments, when they go out and play in these areas they can get properly stung."Help is not just a phone call away. This is not The X Factor, this is mountaineering - you can't become a pro instantly. And you have to treat it almost like a mountain apprenticeship. You need to spend time getting the right knowledge, building up your experience."
Climbers should also check the weather forecast, be prepared to turn back, take a torch and to think about taking other equipment such as crampons and ice axes if there is snow.