Final answer:
Aids to navigation marking the Intracoastal Waterway can be identified by the letters ICW after the aid's number or letter, yellow squares or triangles marked on them, white retroreflective material, and the light characteristic and color for lighted aids.
Step-by-step explanation:
Aids to navigation marking the Intracoastal Waterway can be identified by the letters ICW after the aid's number or letter, yellow squares, or triangles marked on them, white retroreflective material, and the light characteristic and color for lighted aids. For example, aids to navigation with the letters ICW after the aid's number or letter indicate that they are specifically marking the Intracoastal Waterway. Yellow squares or triangles marked on the aids can also help identify them as markers for the Intracoastal Waterway. The use of white retroreflective material and specific light characteristics and colors are additional ways to identify aids to navigation on the Intracoastal Waterway.