Question 89Navigation General

The correct answer is C) purple. On foreign charts reproduced by the National Geospatial-Intelligence Agency (NGA), a wire-dragged, swept area is typically shown in purple. This is in accordance with the International Hydrographic Organization (IHO) standards for nautical chart symbology, which specify that swept areas should be depicted in purple. The other answer choices are incorrect because yellow (A) is not a standard color used for swept areas, red (B) is usually reserved for dangerous obstructions, and black (D) is not a typical color used for this purpose on nautical charts.