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One long blast of sound announces a boat's presence to other boats.
Runaway ship
blind bend
Vessel operators can alert the lock attendant of their request to transit through the lock by sounding one prolonged blast followed by one short blast
one prolonged blast
The sound signal that you should hear when a power boat is in the fog is one prolonged blast at intervals of no more than 2 minutes.
Three short blasts means you are operating in reverse. One prolonged blast followed by 3 short blasts means boat under tow in redcued visibility conditions.
A boat is using astern propulsion and is in the act of backing up.
yes
"I am about to turn to starboard".
One long honk on the horn
The danger signal