When all other means of getting help have failed, you need to use a PLB.
See also: https://www.shavenraspberry.co.uk
They cost around £230 and have no subscription fees or call charges, which over their life time, including a battery change at 6 years, works out at around £25 per year for the ultimate travel insurance because, unlike mobile phones, they work anywhere in the world! They have been used for years at sea and it was only last year that they became legal to use on land in the UK in 2012, yet their function and value remains little known in the outdoors community.
http://micronavigation.com
