| red buoy water surface | ||||||||||||||||||||||||||||||||||||||||
| navigate by keyword : aid assistance beacon buoy buoys clue concept conspicuous contrast decide direction drift gauge guide help hydrology infrastructure logistik marine mark measure measurement navigation navigational oceanography pilot protection red reference research route safety sea shallow shipping ships signal strong support sure surface traffic water waterway acent | ||||||||||||||||||||||||||||||||||||||||
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| Red buoy water surface, symbol of navigation, security, navigation | ||||||||||||||||||||||||||||||||||||||||
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