Authorities in the western United States have reminded travellers not to rely solely on GPS when navigating in remote areas.
The warning follows the case of Albert and Rita Chretien, a Canadian couple, who went missing during a road trip from their home in British Columbia to Las Vegas.
They had used a handheld GPS to guide them and became stuck in snow on a remote track near the Idaho-Nevada border. Rita Chretien was found by hunters with her vehicle after surviving for 48 days but the search for Albert has now been called off. He had set off to find help after after being stranded three days.