BOSTON​ —​ The Coast Guard crews successfully rescued three mariners 20 nautical miles​ off Portsmouth, New Hampshire, Friday evening. At 4:21 p.m., Coast Guard First District watchstanders received notification on 406 MHZ from an Emergency Position Indicating Radio Beacon (EPIRB) registered to the 42-foot sailing vessel Triad. The Coast Guard​ launched a Coast Guard Air Station Cape Cod Leer másCoast Guard rescued 3 mariners 20 miles off Portsmouth, New Hampshire[…]