Marine Fire Signal 2 : A signal of fire from an ocean-going vessel at port in 5 blasts 4-6 sec long, repeated at intervals until answered by a fireboat
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}