This film, from Twig World, looks at how the oceans can be mapped. Charting the waters around the Scottish island of Orkney was a pivotal moment in maritime mapping. But a reliance on outdated maps places modern ships in danger. The key points made in the film are: •Before mapping of the sea floor began, hazards...

This film, from Twig World, looks at the relationship between time and place. In an age before satellite navigation and GPS, one man found an ingenious solution to the problem of determining a ship's location at sea. The key points made in the film are: •Lines of latitude circle the Earth horizontally; lines of...