dan buoy การใช้

• The Flotillas then manoeuvred to keep clear of the approaching expedition and soon after 05 : 00 turned for home, setting flag Dan buoys to mark the channels in daylight on the way back.
• A floating man-overboard pole or dan buoy can be used to indicate that a person is in distress in the water and is ordinarily equipped with a yellow and red flag ( international code of signals flag " O " ) and a flashing lamp or strobe light.