Outdoor sorts are all very impressive, but those with a thirst for adventure tend to go off the beaten track to hostile environments or isolated spots.

While the urge for solitude is understandable and the desire to push yourself to the physical limit admirable, it makes you very hard to locate should you find yourself in a tight spot. Mobile phones don't cover everywhere and are wont to be lacking in power when they're most needed, so a call for help may not be easy to issue.

The Spot GPS satellite tracking device looks like a brightly-coloured baby monitor, but does a whole heap more than trackle and wail. It sends out a regular satellite signal and works with Google Maps to help accurately locate you.

Mobile phones also indicate roughly where you are, again by announcing their presence to a nearby antenna, but satellite nails your location to within a few feet. And satellites triangulate your position absolutely anywhere in the world, just as long as you aren't hidden at the bottom of a chasm or somewhere where the signal can't reach.

The £149 Spot GPS is designed for use in extreme conditions and has a standby time of a year. In tracking mode it can follow you for 14 days, while it will continue to operate in emergency mode for a week. You can be 300 feet below sea level or 21,000 feet up and it will still track you.

A €99 subscription is required, covering 200 check-in messages plus unlimited 911 calls and emails. Additional check-in messages using the satellite service cost 10p each.

While you may not like the idea of broadcasting to the world where you are at any given time, it's the sort of affordable device that could prove exceptionally useful if you're the adventuring type.

Spot GPS satellite tracking device

Spot GPS satellite tracking device