Basic survival celestial navigation

The seasoned polar explorer Franklin lost two vessels and 129 men, himself included, in the late 1840s, searching for the route that would take 3,000nm off the sea route to the Orient. Even though glo

Planetary physicist Dr Sheila Kanani on why now is the time to spot shooting stars and a sunlit Saturn

None of us plans to be caught in a gale, but if it happens then both the boat and the crew must cope. Jake Kavanagh speaks to Jester Challenge skippers and asks how they get ready for stormy weather

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Whether you’re navigating the streets on your smartphone or driving long distances using a satnav device, you’re using a separate system to everyday phone calls and messages

MARK CHISNELL ON DEPTH SENSORS