assist assistance buoyancy circle circular flotation device help kisby ring life preserver life saving buoy lifebelt lifebuoy lifering lifesaver perry buoy red and white rescue rescue aid rescue device ring buoy safety safety device security advice alert announcement be-careful beware black care caution communicating communication danger flotation-device information informing kisby-ring lettering life-preserver life-saving-buoy message no-lifeguard perry-buoy personal-protective-equipment pool red rescue-aid rescue-device ring-buoy risk risks risky safety-device sign signage swim swimming swimming-pool warning warning-sign water white boat buoy captain certified drill drown drowning emergency evacuation ferry flashlight float flotation found guaranteed life lifeboat light lost man overboard on board overboard preserve preserver rescued restored ring safe save sea seaworthy ship sink vessel wave waves hedge post ropes round saftey shrubs trees wall closeup green old s.o.s. texture window yacht