Sail alongside the crew of Kingfisher II as they compete for the 2003 Jules Verne Trophy. People and places - Physical geography - Weather Learning Points The Doldrums is an area near the equator with low air pressure and very little wind. A barometer is an instrument that measures air pressure. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.