Technical Regulations on Reporting Obstacles or Dangerous Positions in Inland Waterways
Based on Item 2.2.2 Section II of the National Technical Regulation QCVN 39:2020/BGTVT issued along with Circular 08/2020/TT-BGTVT (effective from November 01, 2020) specifying:
Obstacle or Dangerous Position Warning on the Channel (B2)
Warning of Obstacle or Dangerous Position on the Right Side of the Navigation Channel (B2.1)
| Shape: Signal is an inverted cone Color: Red Light Signal: One short flash 0.5s cycle 5s, red light Meaning: Indicates “There is an obstacle or dangerous position on the right side of the navigation channel. Vessels must keep a distance of at least 10m from the signal” |
 One short flash Fl.(R) 5s Figure 20: Warning of Obstacle or Dangerous Position on the Right Side of the Navigation Channel (B2.1) |
Warning of Obstacle or Dangerous Position on the Left Side of the Navigation Channel (B2.2)
| Shape: Signal is a cone Color: Green signal, white-bordered Light Signal: At night: one short flash 0.5s cycle 5s, green light Meaning: Indicates “There is an obstacle or dangerous position on the left side of the navigation channel. Vessels must keep a distance of at least over 10m from the signal” **** |
 One short flash Fl.(G) 5s Figure 21: Warning of Obstacle or Dangerous Position on the Left Side of the Navigation Channel (B2.2) |
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