Today , part of the Prestwick site is occupied by the Royal Navy Fleet Air Arm with RNAS Prestwick , ( officially known by the Royal Navy as HMS Gannet ) , where a detachment of 3 Sea Kings provide a search and rescue role , covering one of the largest SAR areas of the UK including Ben Nevis , the Lakes , Northern Ireland and 200 NM ( 370 km ; 230 mi ) past the Irish coast .
They cover Ben Nevis , the Lakes , Northern Ireland and 200 NM ( 370 km ; 230 mi ) past the Irish coast .