Question 379Navigation General

The correct answer is A) yellow stripes, squares, or triangles marked on them. Aids to navigation marking the Intracoastal Waterway (ICW) are identified by the presence of yellow stripes, squares, or triangles on the aid. This is a standard marking used to indicate that the aid is part of the ICW system, which runs along the U.S. East and Gulf Coasts. The other answer choices are incorrect - the light characteristic and color (choice B) are used to identify the type of aid, the letters ICW (choice C) are not a universal marking, and white retro-reflective material (choice D) is a general marking used on many aids, not specific to the ICW.