It is 3 NOT 7 as previously answered.
Three
3
3
1
3
1
1
Ouija board, Wikipedia It, Its A Spiritual Board that supposedly has spirits talk to you
That is 32 board feet.
1
3
3
1
1
mostly 3 must be on board
1
1
3 or more
must be pistol-launched
The minimum number of pyrotechnic Visual Distress Signals (VDSs) required on board varies by jurisdiction. In the United States, for example, the minimum requirement is typically three pyrotechnic VDSs, which may consist of either three hand-held devices or a combination of hand-held and aerial signals. It's important to check your local regulations to determine the exact requirements for your area.
A mixing board combines the signals of several signals into one stereo or mono mix.