The need for Ordnance Survey maps
when navigating in complex mountain territory has been emphasised by a couple of incidents in Snowdonia over the weekend.
Ogwen Valley Mountain Rescue revealed that "a poorly equipped and inexperienced group" got into trouble in the Devil's Kitchen area of the valley, with one of the main problems being they did not have a map.
Without this, the party had "no idea where they were going", the team's website noted, with matters becoming worse as darkness fell and an individual with a heart condition started suffering from a shortness of breath.
And in another case recorded by the team, two men became lost on the Carneddau ridge after their map was blown away in the wind.
The second case may show why it is a good idea when getting an Ordnance Survey map from a Go Outdoors store to buy a map holder as well, which can also keep it clean and dry.
People visiting the Ogwen Valley can navigate using the Ordnance Survey OL17 map.