Bathymetric data acquisition in shallow nearshore waters is often constrained by safety risks and limited access for conventional survey vessels. Satellite-derived bathymetry (SDB) offers a non-intrusive, wide-coverage alternative, particularly effective in coral reef environments. This study evaluates the accuracy of physics-based SDB, processed by EOMAP GmbH & Co. KG using Sentinel-2 imagery, over Agatti Island in the Lakshadweep archipelago. Groundtruth validation was carried out using single beam echo sounder data collected from shallow water crafts and multibeam echo sounder data acquired from survey motorboats and a hydrographic ship. The analysis showed that while SDB provided reliable depth patterns across all zones, vertical uncertainties scaled to the 95% confidence level (LE95 = 1.96 σ) exceeded the IHO S-44 Order 1a TVU limits in all depth bands. These findings, consistent with guidance in IHO B-13 (IHO, 2024), highlight the operational value of SDB for reconnaissance and coastal planning, while underscoring the need for careful statistical treatment of uncertainties when evaluating SDB against hydrographic standards.