How Do Smoke Signal Use?
Use in daytime when a ship, or aircraft, or inhabited land is visible to you.
How Do Hand Flares Use?
Use when the light of a ship, or aircraft, or lights onshore are visible to you. Red hand flares can also be used in daytime.
How Do Parachute Signals Use?
Use when there is good reason to believe that inhabited land, a possible rescue ship or aircraft is within the estimated visibility range of your signals.