When sailing across the world oceans one will no doubt meet the dreaded doldrums. These areas of low-pressure around the equator where the prevailing winds are very calm. The wind can disappear altogether, historically trapping sailing ships for days or weeks on ends. Nowadays, we have a motor so we can escape the Doldrums, but it is great for a swimming break.
The doldrums are created where two trade winds meet, roughly between 5°North and South. The solar heating around the equator forces a circulation of moist air up into the atmosphere, and causes the winds stillness on the surface.