What does LAT stand for?

Lowest Astronomical Tide, abbreviated as LAT, refers to the lowest level of tide that can be expected under normal meteorological conditions and is used as a reference for measuring water depth in nautical charts. LAT represents a critical datum for navigational purposes as it helps mariners understand the minimum depth of water available, ensuring safe passage and avoiding groundings.

The significance of LAT in hydrographic surveying lies in its role in establishing a baseline for vertical measurements. When surveyors assess water depths or chart underwater features, they often reference LAT as the benchmark to ensure consistency and predictability in tidal conditions. The data derived from LAT aids in the planning and execution of maritime operations, as it accounts for the tidal range and helps in making informed decisions regarding navigation and operations in coastal environments.

Understanding LAT is fundamental for hydrographic surveyors, as it impacts charting practices and aids in delivering accurate and reliable data for maritime navigation.