Real sound signal rules in restricted visibility (2 parts) =>
1 long blast = 4 or 5 or 6 seconds
1 short blast = 1 or 2 seconds
QE2, ship Horn, long blast (5 sec):
http://newsquest.coull.com/newsquest...on/QE2horn.mp3
Other fog horn:
140 Harbour ambient sounds for free =>
http://sounddogs.com/results.asp?Typ...bcategoryID=16
Like ShipSiren_01.wav, ShipSiren_04.wav, ShipSiren_05.wav