there is a dangerous situation
When vessels in sight of one another are approaching each other and from any cause either vessel fails to understand the intentions or actions of the other, or is in doubt whether sufficient action is being taken by the other to avoid collision, the vessel in doubt shall immediately indicate such doubt by giving at least five short and rapid blasts on the whistle
They are indicating a dangerous situation exists
From the USCG Navigational Rules of the Road (International and Inland.)Rule 34Maneuvering and Warning Signals(d) When vessels in sight of one another are approaching each other and from any cause one fails to understand the intentions or actions of another, or is in doubt whether sufficient action is being taken by the other to avoid collision, the vessel in doubt shall immediately indicate such doubt by giving at least 5 short and rapid blasts of the ships whistle.
there are 5 sight hear touch taste smell
they are indicating a dangerous situation exist
"Hear" They can HEAR something up to 5 miles away
5 feet
Act 5 scene 5 when they hear a scream
The word hear is mentioned 550 times32 of those in the phrase hear me.31 of those in the phrase hear ye.12 of those in the phrase hear now.5 of those in the phrase hear us.
Lidsville - 1971 Let's Hear It for Whizzo 1-5 was released on: USA: 1971
Get Smart - 1965 Do I Hear a Vaults 5-25 was released on: USA: 8 May 1970