A team of charity fundraisers carried one of its own safety devices during its completion of the national Three Peaks Challenge.
The 14 employees of Portsmouth-based Orolia carried a personal locator beacon made by their own company.
The group carried a McMurdo Fast Find Ranger on their successful ascent of Ben Nevis, Scafell Pike and Snowdon, during which members raised more than £3,000 for the Hampshire and Isle of Wight Air Ambulance.
Fortunately, the charity walkers did not have to activate the PLB, which sends a distress signal to orbiting Cospas-Sarsat satellites. The group, which dubbed itself Team Fast Find, completed the walk in 28 hours despite what it described as horrendous weather.
The team was made up of workers from two countries.
David Duffin, who led the walk, said: “In the space of six months Team Fast Find transformed from office workers to mountain climbers with many hours being spent at the gym and climbing the South Downs and Purbecks in preparation of tackling Ben Nevis, Scafell Pike and Snowdon over three days.
“With no mobile phone reception on any mountain and enduring horrendous weather conditions during the challenge, we all felt safe in the knowledge that we were fully equipped with Fast Find Rangers, enabling us to alert the search and rescue authorities in the event of an emergency.
“We are all very proud to have successfully completed the Three Peaks Challenge and would like to thank all of our sponsors, support team and families who enabled us to achieve our goal and raise money for the Hampshire and Isle of Wight Air Ambulance.”
A change of legislation at the beginning of this year allowed the use of PLBs on land in the UK for the first time.