Knowledge of both latitude and longitude was required.Finding an accurate and reliable method of determining longitude took centuries of study, and involved some of the greatest scientific minds in human history.Judging by the bodies found so far, none of the remaining crew made it even a fifth of the way to safety.The women were found to have European DNA, meaning they couldn't be the remains of local Inuits.'We were surprised by the results for those samples because in planning the analysis it hadn't occurred to us that there might have been women onboard,' study lead author Dr Douglas Stenton told Live Science.This image shows the mummified remains of one of the expedition's doomed crew members The expedition, consisting of two ships led by British Royal Navy captain Sir John Franklin, aimed to find a sea route linking the Atlantic and Pacific oceans.But the crew was condemned to an icy death after their two ships got jammed in thick sea ice in the Canadian Arctic in 1846.Recreational sailing or yachting can be divided into racing and cruising.

A course defined with respect to the true wind direction is called a point of sail.

Eratosthenes in the 3rd century BC first proposed a system of latitude and longitude for a map of the world.

By the 2nd century BC Hipparchus was the first to use such a system to uniquely specify places on the earth.

Conventional sailing craft cannot derive power from sails on a point of sail that is too close into the wind.

On a given point of sail, the sailor adjusts the alignment of each sail with respect to the apparent wind direction (as perceived on the craft) to mobilize the power of the wind.