Id 36 - ATPL - An aircraft flying at flight level 370 (FL 370) in NAT HLA (North Atlantic High Level Airspace) is unable to continue flight in accordance with its air traffic control clearance but is able to maintain its assigned level (FL 370), and due to a total loss of communications capability, cannot obtain a revised clearance from ATC. The aircraft should leave its assigned route or track by turning 90° (90 degrees) to the right or left whenever this is possible, and turn to acquire and maintain in either direction a track laterally separated by 30 NM from its assigned route and: