Example image of eyePlorer eyePlorer map for 'Mayday (distress signal)': Code word Distress signal Voice procedure Aviator Firefighter Police Radio silence Very high frequency 2182 kHz Air traffic control Airband Coast guard Marine VHF radio Medium frequency 1-1-2 9-1-1 Emergency service Morse code SOS Helicopter Lifeboat (rescue) Search and rescue Call sign Croydon Airport London Paris Paris - Le Bourget Airport Pan-pan Geneva Conventions Cockpit Swissair Flight 111 2005 Global Maritime Distress Safety System June 29 List of French words and phrases used by English speakers Vessel emergency codes Distress and Diversion Kenny May MV Pacific Opal Channel 16 VHF HMS Herald (H138) MV Holmglen 2008 Farnborough plane crash Canadian Pacific Airlines Flight 21 PIA Flight 740 Securite VX381 Fairey Firefly wreck Black Magic (manga) Hong Kong Passage Hull triple trawler tragedy (1968)