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The GEBCO30 bathymetric data resolution 0.5 nautical miles in the Gulf of Thailand were corrected by comparison with the digitized Navigation Charts data from 47 charts in total that were surveyed and published between 1991 and 2005. The correction of bathymetric data and modification of map resolution from 926 meters to 200 and 50 meters were done by using scripts of the Generic Mapping Tools (GMT) programming. The result showed that the corrected GEBCO30 data in the Gulf of Thailand resolution 50 meters had 27,704,202 data and depth ranges (-97.99) – (2.51) meters. 99.07% of the data showed the discrepant depths with total horizontal uncertainty within 95% confidence level of ±10 meters. All of the data showed the discrepant depths with total vertical uncertainty within 95% confidence level of ±1.3685 meters and the value of Standard Deviation (SD) of 0.1945 that was better than the resolution 926 and 200 meters, respectively. The corrected GEBCO30 bathymetric data and adjusted resolution to 50 meters had the confidence following the standard of the International Hydrographic Organization, and all data also showed SD less than 1% of water depth.
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