100016.932019-08-092019-08-102019-08-112019-08-122019-08-132019-08-142019-08-152019-08-16000006.6253.64016.860280100000115.3007.410280300000138.3409.450The entire survey is adequate to supersede previous data.Pydro QC Tools 3 Grid QA was used to analyze H13272 multibeam echosounder (MBES) data density. Software errors were identified when performing quality control checks on Caris variable-resolution surfaces that include discontinuous coverage and large ungridded areas such as found on this survey. In order to work around this error, two separate surfaces were created and analyzed: one of the main survey area (1of2), and a second of the northern shoal investigation area (2of2). The submitted H13272 finalized variable-resolution (VR) surfaces met HSSD density and full coverage requirements as shown in the histograms below.Pydro derived plot showing HSSD density compliance of H13272 finalized variable-resolution MBES data (main survey area).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_1of2_Final.QAv5.density.pngPydro derived plot showing HSSD full coverage compliance of H13272 finalized variable-resolution MBES data (main survey area).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_1of2_Final.QAv5.pct_res.full_cov.pngPydro derived plot showing HSSD density compliance of H13272 finalized variable-resolution MBES data (northern shoal investigation area).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_2of2_Final.QAv5.density.pngPydro derived plot showing HSSD full coverage compliance of H13272 finalized variable-resolution MBES data (northern shoal investigation area). file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_2of2_Final.QAv5.pct_res.full_cov.pngThis survey is part of a larger project area encompassing 225 square nautical miles; it is heavily trafficked by container ships, tankers, barges, commercial and recreation fishing vessels, and tourism industry vessels. Lahaina Harbor is home to sport fishing, sailing, diving and whale watching vessels as well as a ferry to Lanai. Despite the volume of maritime traffic, the vast majority of bathymetric data in the project area were acquired prior to 1984. This survey will provide modern bathymetric data for updating National Ocean Service (NOS) charting products as well as support for the Seabed 2030 global mapping initiative. H13272 data is intended to supersede all prior survey data in the common area. All watersComplete Coverage (Refer to HSSD Section 5.2.2.3)Complete multibeam echosounder coverage was acquired to the inshore limit of hydrography, the Navigable Area Limit line (NALL). The Project Instructions defined the NALL for this survey as 10-meters water depth, shown as red in Figure 7. Six coverage gaps, "holidays," were identified after leaving the survey area. Unfortunately, most of the holidays were apparently due to inadequate overlap with existing coverage on the final day of acquisition. The largest holiday measures approximately 5 x 119 meters and is located near the southeast end of the survey (Figure 8). Each coverage gap was examined with Caris subset editor; no navigationally significant features were apparent in the area of the holidays; least depths are believed to be represented.H13272 NALL determination and coverage gap locations / size.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Nall_Holidays.JPGLargest coverage gap in H13272 MBES data. Note inappropriately wide spacing of survey vessel trackline (solid green line).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_5by119m_Holiday.JPGH13272 survey coverage was extended beyond the originally assigned survey limits in order to investigate three reported shoals (Figure 2). For additional information, refer to Project Manager correspondence submitted in appendix II of this report.Overview of expanded H13272 survey coverage.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Survey_Coverage.jpg156.62084161120.7976524167156.75989686120.9945011944This survey area is referred to as H13272, "Vicinity of Lahaina" (sheet 2) in the Project Instructions. The assigned survey area encompassed approximately 15 square nautical miles within the Auau Channel, directly west of Lahaina on the Hawaiian Island of Maui. Nearly all of the assigned survey area falls within the Hawaiian Islands Humpback Whale National Marine Sanctuary.H13272 originally assigned survey area (Charts 19347, 19007).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Survey_Area.jpgH13272 main survey coverage including shoal investigation area northwest of original assigned sheet limits (shown as black dashed line). file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Main_Coverage.jpgH13272 northern shoal investigation coverage area (Chart 19347). Chart units fathoms, survey units meters.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_North_Coverage.jpgNOAA Ship Rainier (S221)Hawaiian Islands and VicinityHawaiian Islands and VicinityOPR-T383-RA-19NOAA2019-08-092019-08-16Pacific Hydrographic BranchMultibeam Echo Sounder BackscatterMultibeam Echo SounderBenjamin K. Evans, CAPT/NOAA2019-06-28metersUTC Zone 4 NorthNavigable Area2019HawaiiH1327250002Vicinity of LahainaUnited StatesAdditional information discussing the vertical or horizontal control for this survey can be found in the accompanying 2019 DAPR.Mean Lower Low Water1612340Honolulu, HI1612480Mokuoloe, HI1615680Kahului, HIERS via ERTDMImmediately following each H13272 MBES acquisition day, predicted tides were applied to the data using preliminary TCARI grid T383RA2019.tc. This was done solely to provide an initial vertical reference datum during QC analysis and preparation of the next day's survey launch materials. All submitted H13272 MBES data were reduced to MLLW using ERTDM processing methods. Final water levels were not requested and no other traditional vertical control steps were taken.OPR-T383-RA-19_ERTDM_NAD83(2011)_MLLW_ext.csarNorth American Datum 1983RTXPrecise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSPac MMS (8.2.1) software to produce SBETs for post-processing horizontal correction.Projected UTM 4The Wide Area Augmentation System (WAAS) was used for real-time horizontal control for this survey.No shoals or potentially hazardous features were identified in the survey area that are not discussed elsewhere in this report or included in the H13272 Final Feature File.ENC US5HA24M covers all of H13272 with the exception of a small triangular shaped area of 0.06 square nautical miles located at the western most extent of the sheet (Figure 20). The seafloor within the H13272 survey area is highly dynamic, especially in the more offshore areas. As expected, there were numerous inconsistencies between H13272 complete coverage MBES data and NOS charting products that used historic, partial bottom coverage data. Figure 21 illustrates the differences between the 30-fathom depth areas derived from H13272 data and the 30-fathom depth curves found on ENC US5HA24M. There is general overall agreement but significant discrepancies exist between the two data sets. The ENC (US5HA24M) 20-fathom depth curve and the H13272 20-fathom contour generally agree, although the survey derived contour is inshore of the ENC by up to 300 meters in some areas. The ENC also displays several small 20-fathom areas well to the west of any 20-fathom depths identified by H13272 data (Figure 22). Figure 23 illustrates that the ENC 10-fathom depth curve and H13272 derived contours are in close agreement; the survey 10-fathom contour is slightly inshore of the charted position. Similarly, the ENC 5-fathom depth curve and H13272 5-fathom contours show close agreement (Figure 24). Insufficient data exists to perform a meaningful comparison of depths shoaler than 5-fathoms, however where H13272 MBES coverage extended to the 3-fathom range, it agreed closely with the ENC (Figure 25). 82017-08-29false2017-08-2915000US5HA24MENC US5HA24M overlaid with H13272 survey limits (dashed green line). The area not covered by ENC is circled in red.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/ENC_US5HA24M.jpgENC US5HA24M 30-fathom depth curves (dark blue outline) overlaid on H13272 30-fathom depth areas (light blue solid fill). Assigned sheet limits shown as dashed green line, Chart 19348.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_30fthm_Comparison.JPGENC US5HA24M 20-fathom depth curve (orange) and H13272 20-fathom contour (blue) overlaid on Chart 19348. Assigned sheet limits shown as dashed green line.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_20_fathom_Comparison.JPGENC US5HA24M 10-fathom depth curve (brown) and H13272 10-fathom contour (gold) overlaid on Chart 19348.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_10fathom.JPGENC US5HA24M 5-fathom depth curve (red) and H13272 5-fathom contour (bright green) overlaid on Chart 19348. Assigned sheet limits shown as dashed green line. file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_5_fathom.JPGENC US5HA24M 3-fathom depth curve (yellow) and H13272 3-fathom contour (red) overlaid on Chart 19348file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_3_fathom.JPGENC US4HA23M covers the small area of H13272 not included on ENC US5HA24M and the additional shoal investigation areas located to the north and west. Within the northern-most shoal investigation area, H13272 complete MBES coverage disproved the 18-fathom shoal reported in 1957 and the corresponding 50-fathom depth curve; the actual depths in the area are approximately 90 to 96-fathoms (Figure 26). The H13272 derived 100-fathom depth contour in this area closely agreed with the ENC 100-fathom curve located approximately 30 meters northwest. H13272 complete MBES coverage disproved the two 12-fathom shoals reported in 2006 located northwest of the originally assigned survey area. Least depths over the 2006 reported PA shoals were approximately 18-fathoms (Figures 27-28). There are no charted depth curves included on the ENC within this shoal investigation area.152019-09-27false2018-08-0380000US4HA23MSection of ENC US4HA23M covering the northern shoal investigation area. H13272 derived 100-fathom depth contour and selected soundings are overlaid (shown in blue).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Shoal_Investigation_North.JPGSection of ENC US4HA23M covering the northwestern shoal investigation area with H13272 selected soundings overlaid in blue.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Shoal_Investigation_West.JPGH13272 selected soundings and variable-resolution surface overlaid on Chart 19347. Note that least depth over both reported 12-fathom shoals is approximately 18-fathoms.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Shoals_NW.JPG H13272 located an uncharted wreck between two charted fish havens, approximately 0.6 nautical miles south of Makila Point (Figure 33). The least depth of the 30-meter long wreck is 13-fathoms. The wreck appears to be well-known locally as it is regularly visited by commercial dive boats. The wreck is included in the H13272 Final Feature File submitted with this report.H13272 well-known uncharted wreck.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_UnchartedWreck.JPGA comparison was made between H13272 survey data and Electronic Navigational Charts (ENC) US5HA24M and US4HA23M using CUBE surfaces, selected soundings and contours created in Caris.Bottom samples were not required for this survey.No Maritime Boundary Points were assigned for this survey.Three reported shoal areas located outside the originally assigned survey limits, were investigated and are addressed in section D.1 of this report. One non-dangerous wreck, charted approximately 0.65 nautical miles southwest of the Lahaina boat basin, was not apparent in H13272 complete coverage MBES data (Figure 29). A wreck charted as "showing any portion of hull or superstructure" was not visually apparent during H13272 survey operations (Figure 30). The charted location was inshore of the NALL, therefore no MBES coverage was possible. Subsequent communication with the Lahaina Harbor Agent confirmed that the entire wreck was removed a few years ago. See Supplemental Correspondence for more information. Lahaina Light, a prominent and picturesque lighthouse located on the Lahaina waterfront (Figure 31), is mischarted on ENC US5HA24M (Figure 32). The actual position should be approximately 388 meters north of its ENC position. Chart 19007 is indicated as the source for the feature; the scale of 19007 is 1:1,650,000. Positional accuracy of such a small-scale chart is not high and is the likely cause of the incorrect location for the light. RNC 19348 shows the actual position of Lahaina Light much more accurately (Figure 30). ENC US4HA23M shows the same incorrect position for Lahaina Light, but also mistakenly shows a land area point feature at the actual location of the Light. The H13272 Final Feature File addresses the positional discrepancy of the ATON. Notification of this error was made using ASSIST, the on-line system for reporting nautical chart errors to NOAA's Office of Coast Survey (see Supplemental Correspondence). The error has been corrected on NOS charting products.Section of Chart 19348 showing location of wreck PA, overlaid with H13272 1-meter resolution surface. No indication of this offshore wreck was apparent.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Wreck_PA.PNGLahaina Harbor Agent stated this charted wreck has been completely removed.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_DisprovedWreck.JPGLahaina Light as seen in Google Earth image.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/LahainaLight_GoogleEarth.JPGENC US5HA24M showing incorrect position of Lahaina Light.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/US5HA24M_LahainaLight_Mischarted.JPG NOS charting products for the vicinity of Lahaina include an information note that reads: "The entrance channel is marked by privately maintained buoys. In August 2009, the reported depths in the basin range from 6 to 8 feet (1.8 to 2.4 meters)." Most H13272 depths within the boat basin ranged from 9 to 11 feet. It should be noted that maneuverability was extremely restricted within Lahaina's confined and busy harbor, therefore survey operations within were significantly hampered.Chart 19348 overlaid with H13272 1-meter resolution MBES surface and selected soundings. file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_BoatBasin_feet.JPGNo platforms were located in the survey area.Limited shoreline verification was conducted within the H13272 survey area using the Composite Source File (CSF) provided by NOAA HSD Operations Branch. In the field, all assigned features that were deemed safe to approach, were addressed as required with S-57 attribution and recorded in the H13272 Final Feature File (FFF) to best represent features at chart scale. This file also includes new features found in the field as well as recommendations to update, retain or delete assigned features. Features that were unsafe to approach were attributed in the FFF as Not Addressed and the reason stated.Nearly the entire seafloor within H13272 display physical characteristics of potential interest to researchers in the fields of marine geology, seismology, benthic ecology and more.Section of seafloor within the H13272 survey area (4-meter resolution, vertical exaggeration = 3).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Seafloor.JPGNo new surveys or further investigations are recommended for this area.No overhead features were observed within the survey area.No new insets are recommended for this area.The Lahaina boat basin entrance channel is marked by privately maintained buoys; their position and status appear more subject to change than do USCG navigation aids. Mariners operating in the Lahaina boat basin are advised to seek local knowledge of the area. Further information regarding ATONs within the survey area is included in the H13272 Final Feature File submitted with this report.Outbound view of privately maintained buoys marking Lahaina entrance channel.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/LahainaBuoys.JPGThere is daily scheduled ferry service across Auau Channel between Lahaina Harbor and Manele Harbor on the island of Lanai.A charted cable area extends approximately 2.7 nautical miles along the southwestern corner of the survey area. No indication of the cable was evident in H13272 MBES or MBAB data.No present or planned construction or dredging exist within the survey limits.All sounding systems were calibrated as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.7.8.1QPSFledermaus Geocoder Tool Box (FMGT)NOAA Profile Version 2019v111.1.03CARISHIPS and SIPSSubmitted surfaces were generated using NOAA recommended parameters for depth-based (Ranges) Caris variable-resolution bathymetric grids. One sounding was designated for an uncharted, non-dangerous wreck; the feature was included in the H13272 Final Feature File submitted with this report. No Dangers to Navigation were identified within the survey area. Pydro QC Tools 3 Find Fliers (v8) program with default settings was used to identify sounding fliers in H13272 MBES data; no fliers were detected. Screen grab of Pydro Find Fliers results of submitted H13272 VR surfaces.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_FlierFinderResults.jpgNOAA_VR97.842.18H13272_MB_VR_MLLW_1of2CARIS VR Surface (CUBE)Variable ResolutionComplete MBESNOAA_VR97.842.18H13272_MB_VR_MLLW_1of2_FinalCARIS VR Surface (CUBE)Variable ResolutionComplete MBESNOAA_VR204.7697.88H13272_MB_VR_MLLW_2of2CARIS VR Surface (CUBE)Variable ResolutionComplete MBESNOAA_VR204.7697.88H13272_MB_VR_MLLW_2of2_FinalCARIS VR Surface (CUBE)Variable ResolutionComplete MBESRefer to the Data Acquisition and Processing Report (DAPR) for a comprehensive description of data acquisition and processing systems, survey vessels, quality control and processing methods. Additional information to supplement soundings and other survey data and any deviations from the DAPR are discussed in this report.Positioning and Attitude SystemApplanixPOS MV 320 v5MBESKongsberg MaritimeEM 2040Conductivity, Temperature, and Depth SensorSea-Bird ScientificSBE 19plusSound Speed SystemTeledyne RESONSVP 70Refer to the Data Acquisition and Processing Report (DAPR) for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. Additional information to supplement sounding and survey data, and any deviations from the DAPR are discussed in the following sections.NOAA Ship RAINIER survey launch 2803 moored in Lahaina boat basin.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/2803_Lahaina_2019.jpgAll H13272 data were acquired by NOAA Ship RAINIER survey launches 2801 and 2803. These vessels acquired depth soundings, backscatter imagery and sound speed profiles. Limited shoreline feature verification was also conducted from launch 2803.1.128018.81.128038.8RAINIER launches 2801 and 2803 acquired 16.86 nautical miles of MBES crosslines across all depth ranges, water masses and boat days that were safe and operationally practical. Crosslines were not acquired outside the originally assigned survey area, however the Hydrographer deems them adequate for verifying and evaluating the internal consistency of H13272 sonar data. Crossline analysis was performed using the Compare Grids function within Pydro Explorer on Caris variable-resolution surfaces of H13272 mainscheme only and crossline only data. 99.5+% of grid nodes met allowable uncertainties, see Pydro generated histograms below.H13272 VR crossline surface overlaid on mainscheme tracklines.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_XLs.jpgPydro derived plot showing node percentage-pass value of H13272 mainscheme to crossline data.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_MS_Only_VR_MLLW-Diff_H13272_MB_XL_Only_VR_MLLW_fracAllowErr_Freq.pngPydro derived plot showing absolute difference statistics of H13272 mainscheme to crossline data.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_MS_Only_VR_MLLW-Diff_H13272_MB_XL_Only_VR_MLLW_depth_delta.pngSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.H13272 sound speed cast locations.file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_Casts.jpgTwenty eight sound speed profiles were acquired for this survey at discrete locations within the survey area at least once every four hours, when significant changes to surface sound speed were observed, or when operating in a new area. Sound speed profiles were acquired using Sea-Bird Scientific SBE 19plus profilers. All casts were concatenated into a master file and applied using the "Nearest distance within Time" (4 hours) profile selection method within Caris.0.0532801, 28030ERS via VDATUM0.12Total Propagated Uncertainty (TPU) values for survey H13272 were derived from a combination of fixed values for equipment and vessel characteristics, as well as from field assigned values for sound speed uncertainties. The uncertainty value of NOAA's Ellipsoid Referenced Tidal Datum Model (ERTDM) was provided with the Project Instructions. In addition to the usual a priori estimates, some real-time and post-processed uncertainty sources were also incorporated into the depth estimates of this survey. Real-time uncertainties from Kongsberg MBES sonars were recorded and applied in post-processing. Applanix TrueHeave (POS) files, which record estimates associated with vessel position and attitude were applied in Caris HIPS using SBET and RMS files generated using POSPac MMS software. Uncertainty values of the submitted finalized grid was calculated in Caris using "Greater of the Two" of uncertainty and standard deviation (scaled to 95%). Grid QA within Pydro QC Tools 3 was used to analyze H13272 Total Vertical Uncertainty (TVU) compliance; a histogram plot of the results is shown below.Pydro derived plot showing TVU compliance of H13272 finalized multi-resolution MBES data (main survey area).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_1of2_Final.QAv5.tvu_qc.pngPydro derived plot showing TVU compliance of H13272 finalized multi-resolution MBES data (northern shoal investigation area).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MB_VR_MLLW_2of2_Final.QAv5.tvu_qc.pngNone ExistThere were no other factors that affected corrections to soundings.All equipment and survey methods were used as detailed in the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.Raw backscatter data was acquired as .all files logged during MBES operations and subsequently processed by RAINIER personnel. The .GSF files created during processing and backscatter mosaics separated by vessel and frequency have been delivered with this report. Backscatter processing procedures are described in the DAPR.Overview of H13272 multibeam acoustic backscatter coverage (assigned sheet limits shown in green).file:///K:/Projects/2019_Projects/OPR-T383-RA-19_Hawaiian%20Islands%20and%20Vicinity/Survey/H13272_Vicinity_of_Lahaina/Descriptive_Report/Report/Images/H13272_MBAB.jpgAll field sheets, this Descriptive Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.The survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys Specifications and Deliverables, Field Procedures Manual, Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required with the exception of deficiencies noted in the Descriptive Report.As Chief of Party, field operations for this hydrographic survey were conducted under my direct supervision, with frequent personal checks of progress and adequacy. I have reviewed the attached survey data and reports.2019-11-13Benjamin K. Evans, CAPT/NOAACommanding Officer2019-11-13Hadley A. Owen, LT/NOAAField Operations Officer2019-11-13James B. JacobsonChief Survey Technician2019-11-13B.D. JacksonSenior Survey Technician