Basic Hydrographic Survey 2021 W00677 Maine Portland Casco Bay, Hussey Sound 20000 2021-08-01 2021-08-31 ESD-AHB-23 State of Maine Peyton Benson MBES Kongsberg Maritime EM 2040C MBES Backscatter Kongsberg Maritime EM 2040C Atlantic Hydrographic Branch meters Any 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 WGS84 UTM 19N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit. World Geodetic System (WGS) 1984 Mean Lower Low Water Discrete Zoning Projected UTM 19 2022-10-03 CC0-1.0 (External Source Data) CC0-1.0 https://creativecommons.org/publicdomain/zero/1.0/ https://creativecommons.org/publicdomain/zero/1.0/legalcode This data is licensed under a Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0). 2023-04-18 Atlantic Hydrographic Branch Peyton Benson Maine Coastal Mapping Initiative Program Coordinator State of Maine AHB This survey was a part of a large data set provided by the State of Maine Coastal Mapping Initiative. Survey products were created by the Atlantic Hydrographic Branch. This survey does not include a data acquisition and processing report. All data were reviewed for DTONs and none were identified in this survey. The State of Maine Coastal Mapping Initiative https://www.maine.gov/dmr/programs/maine-coastal-program/coastal-science-and-research/maine-coastal-mapping-initiative/ This survey does meet charting specifications and is adequate to supersede prior data. This survey will be used to update NOAA navigational products.