How often should LAT be reviewed?

The correct answer is that LAT (Lowest Astronomical Tide) should be reviewed every 20 to 25 years. Regular reviews of LAT are crucial for ensuring the accuracy and reliability of nautical charts and hydrographic data. As natural conditions change—such as land shifts, sediment deposition, and sea-level rise—data may become outdated, impacting navigational safety.

Reviewing LAT in this time frame allows for the incorporation of new measurements and advancements in technology that enhance the precision of tidal predictions. By failing to update this information regularly, the risk of navigational errors increases, particularly for vessels operating in shallow waters or environments where precise tide measurements are critical.

Considering the correct timeframe aligns well with the practices established in hydrographic surveying, as they emphasize the importance of maintaining up-to-date data to adapt to ongoing environmental changes.