Depends what boat your talking about.
Most flare guns are single shot.
Flare - science fiction novel - has 344 pages.
Flare guns are used in case of emergencies in many instances. If you get lost in the woods you can shoot off a flare gun to help search groups find you.
710 out of 2,224 people survived
it depends on the size weight and girth of them
712 people survived the sinking of Titanic.
There are many inventors that were women. The woman who invented the night flare was called by the name of Martha Coston.
Many types of signal exists.
Of the 2,208 people on board Titanic, 1,496 did not get into lifeboats; 68%.
There was about 4,300 people on the Costa Concordia
Buru-honoo sorry I don't know the Japanese characters(letters) for it.