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auto-alarm
auto-alarm n. 
/ˈɑdoʊəˌlɑrm/ an automatic fire alarm, burglar alarm, etc.; spec. a ship's alarm which transmits a distress signal by radio when triggered.
Brit. /ˈɔːtəʊəlɑːm/
, /ˈɔːtəʊəlɑːm/U.S. /ˈɔdoʊəˌlɑrm/
, /ˈɔdoʊəˌlɑrm//ˈɑdoʊəˌlɑrm/ΘΚΠ
society > communication > indication > signalling > audible signalling > [noun] > alarm signal generally > distress signal
auto-alarm1899
1899 Chicago Tribune Nov. 4 14/3 The report of the Auto-Alarm committee was referred to the Executive committee.
1927 Glasgow Herald 18 July 10 The object of the auto-alarm is to ensure that the call shall be received by the smaller ships and that no wireless distress calls shall be missed by any ship owing to the operator being off duty.
1954 Times 18 Mar. 14/3 A new and more advanced automatic-alarm receiver which..responds automatically if the auto-alarm signal is received.
2002 N. Thorpe 8 Men & Duck 2003 ix. 141 What would happen if our dented radar reflectors failed to trip the ship's auto-alarm?
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