Seas the Day Charters runs one of the most sleek and comfortable boats on the water.The Manta is a custom Calcutta 263 Sport Catamaran and is one of only 7 made with the “Slashback” planing hull. Seas The Day Charters US offers custom charters of scenic Sarasota, Venice, Nokomis, Siesta Key Waters. Make life long memories for Families and Friends Alike, Get your Family & Friends ready for an adventure!