According to the International Hydrographic Organization, hydrography primarily supports what?

Hydrography primarily supports safety of navigation, as outlined by the International Hydrographic Organization (IHO). This discipline is essential for the accurate mapping and assessment of water bodies, ensuring that mariners are aware of underwater hazards, the shapes of coastlines, and the depths of navigable channels. Accurate hydrographic data helps in creating nautical charts and providing information that is crucial for safe maritime operations. These charts, derived from hydrographic surveys, inform navigators about the best and safest routes for ships, thereby reducing the risk of accidents at sea.

While marine biology, weather analysis, and recreational boating play important roles in the broader context of marine activities, they are secondary or ancillary to the primary function of hydrography, which is to enhance navigational safety and efficiency in maritime travel. The focus on navigation safety serves to uphold maritime safety, protect marine environments, and support international trade and commerce.