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#signal flag #international code of signals #ICS #nautical communication #ship communication #maritime signal flag

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#naval flag pattern #signal flag #ship communication #maritime signal #patterned ensign #nautical code

🆘🚢🌊

#maritime emergency #mayday #help signal #ship communication

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#sprechrohr #ship communication #marine voice pipe #naval speaking tube #boat intercom

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#sprechrohr #communication tube #voice pipe ends #acoustic link #ship communication #flared ends