Which one of the following is true about red buoys?
How many types of buoys are there?
Daymarks. Green squares with odd numbers are the equivalent of can buoys; keep this marker on your left side. Red triangles with even numbers are the equivalent of nun buoys; keep this marker on your right side. Both green squares and red triangles can be lighted as well.
Based on the lateral system, on the starboard side, one can find the red even numbered marks while the odd-numbered, green, marks are located on the port side of a channel such that the buoy numbers increase as a vessel travels upstream. Therefore, the correct option is 1. Some are known as “NUN” buoys.