EM 1002Kongsberg MaritimeMBESESD-PHB-212000-06-102000-05-23Basic Hydrographic Survey2021-06-15Projected UTM 16Pacific Hydrographic BranchGulf of MexicoUS Geological SurveyMean Lower Low Watermeters2000W00582North American Datum 1983125000James V. GardnerAny revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 16N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit. 80NM South of MobileAlabamaPHB2021-09-13U.S. Geological SurveyChief of PartyJames V. GardnerPacific Hydrographic BranchSurvey products were generated by the hydrographic branch.This survey does meet charting specifications and is adequate to supersede prior data.The purpose of this survey was to map a sequence of drowned reef complexes along the 40-fathom shelf edge of the northern Gulf of Mexico called The Pinnacles.https://doi.org/10.3133/ofr00350United States Geological SurveyAll survey systems and methods utilized during this survey were as described in USGS Open-File Report 00-350.All data were reviewed for DTONs and none were identified in this survey.