MBESKongsbergEM710MBESReson7125 SV1Conductivity, Temperature, and Depth SensorSeabird19plusSound Speed SystemResonSVP70Sound Speed SystemResonSVP71Conductivity, Temperature, and Depth SensorRolls RoyceMVP200Positioning and Attitude SystemApplanixPOS/MV V44.770.4S2201.128.6428051.128.6428061.128.6428071.128.642808Refer to the OPR-O190-FA-16 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.Raw Backscatter data were logged as .7k files for Reson 7125 data. Kongsberg EM710 stores the backscatter data in the .all file. The data have been sent to the Pacific Hydrographic Branch for processing. One line per vessel per day of acquisition was processed by the field unit for quality control.All data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Data LogsData acquisition and processing notes are included in the acquisition and processing logs, and additional processing such as final tide and sound velocity application are noted in the H12865 Data Log spreadsheet. All data logs are submitted digitally in the Separates I folder.SupportFiles\Designated Soundings Overview.pngOverview of designated soundings in H12865Designated SoundingsH12865 contains eight designated sounding in accordance with HSSD Section 5.2.1.2.3. Seven designated soundings represent DTONs (see Section D.1.6), and the remaining one designated sounding was selected to accurately represent the seafloor. The designated sounding is in a rocky area where the CUBE surface did not accurately depict the true seafloor. Figure 25 shows an overview of the survey area and the location of the designated soundings.Complete MBESCUBE1H12865_MB_1m_MLLWNOAA_1mComplete MBESCUBE2H12865_MB_2m_MLLWNOAA_2mComplete MBESCUBE4H12865_MB_4m_MLLWNOAA_4mComplete MBESCUBE8H12865_MB_8m_MLLWNOAA_8mComplete MBESCUBE16H12865_MB_16m_MLLWNOAA_16m026Complete MBESCUBE1H12865_MB_1m_MLLW_FinalNOAA_1m1852Complete MBESCUBE2H12865_MB_2m_MLLW_FinalNOAA_2m36104Complete MBESCUBE4H12865_MB_4m_MLLW_FinalNOAA_4m72208Complete MBESCUBE8H12865_MB_8m_MLLW_FinalNOAA_8m144416Complete MBESCUBE16H12865_MB_16m_MLLW_FinalNOAA_16mThe NOAA CUBE parameters mandated in the HSSD were used for the creation of all CUBE surfaces in Survey H12865. The surfaces have been reviewed where noisy data, or "fliers," are incorporated into the gridded solutions causing the surface to be shoaler or deeper than the true sea floor. Where these spurious soundings cause the gridded surface to be shoaler or deeper than the reliably measured seabed by greater than the maximum allowable Total Vertical Uncertainty at that depth, the noisy data have been rejected and the surface recomputed. Flier Finder v3, part of the QC Tools package within Pydro, was used to assist the search for spurious soundings following gross cleaning. Flier Finder was run multiple times for each surface, reducing the flier height value for each consecutive run. This allowed Flier Finder to very accurately and quickly identify gross fliers, but as the flier height was reduced the effectiveness of the tool diminished. With smaller heights, Flier Finder began to incorrectly flag dynamic aspects of the seafloor such as steep drop offs and rocky areas as fliers resulting in hundreds of false positives. At this point, the hydrographer ceased using the tool and returned to manual cleaning for these dynamic regions of seafloor. In order to prevent visual data gaps between the finalized surfaces, the 1, 2, 4, 8, and 16 meter surface depths were extended for greater overlap between the surfaces. The surfaces and depth ranges are listed in Table 11. All finalized surface depth ranges were extended deeper by 6 times the surface resolution. To determine how much to expand the depth range by, the largest gap in coverage that could be found was measured in CARIS HIPS and SIPS subset editor. The distance of the gap was divided by the resolution of the surface that would cover the gap to determine how many multiples of that resolution it would take to cover that gap. This number was then multiplied by 2 to ensure that all gaps would be covered resulting in the extension of the surfaces by 6 times their resolution. All surfaces still meet the density and NOAA uncertainty requirements for their extended ranges. As a minimal percentage by area of H12865 met the depth threshold for the 32 meter depth range, a waiver to extend the 16 meter surface depth range and not submit a 32 meter surface was granted from the Hydrographic Survey Division Operations Branch, and is located in Appendix II. All data within the extended 16 meter surface meets the coverage requirements as defined by the HSSD. This waiver also covers the extension of all grids per the methods described in the previous paragraph.NOAA Profile Version 5.4CARISHIPS and SIPSHIPS 9.1FledermausFMGT7.5.3All equipment and survey methods were used as detailed in the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.H1274420000NNOAA Ship FAIRWEATHER2015SupportFiles\H12865 - H12744 Junction Difference.pngJunctioning surveys H12865 and H12744 with difference surface. Greatest differences are indicated in black and red and occur in rocky/steep areas. SupportFiles\H12865 - H12744 Junction Statistics.pngStatistical output of difference surface for H12865 and H12744.SupportFiles\H12865 - H12744 NOAA Allowable.pngH12865 junction with H12744 NOAA allowable uncertainty.SupportFiles\H12865_H12744_8m_Difference.pngH12865 junction with H12744 NOAA allowable uncertainty statistics.Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 8 meter combined surface from H12865 and the 8 meter combined surface from H12744. The statistical analysis of the difference surface shows a mean of -0.82 meters with 95% of all nodes having a maximum deviation of +/- 2.35 meters, as seen in Figure 9. A detailed graphical overview can be seen in Figure 8. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 10). It was found that 95.88% of nodes are within allowable NOAA uncertainty (Figure 11).H1288020000ENOAA Ship FAIRWEATHER2016SupportFiles\H12865 - H12880 Junction Difference.pngJunctioning surveys H12865 and H12880 with difference surface. Greatest differences are indicated in black and red and occur in rocky/steep areas. SupportFiles\H12865_H12880_16m_Difference.pngStatistical output of difference surface for H12865 and H12880.SupportFiles\H12865 - H12880 NOAA Allowable.pngH12865 junction with H12880 NOAA allowable uncertainty.SupportFiles\H12865 - H12880 NOAA Allowable Statistics.pngH12865 junction with H12880 NOAA allowable uncertainty statistics.Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 16 meter combined surface from H12865 and the 16 meter combined surface from H12880. The statistical analysis of the difference surface shows a mean of 0.28 meters with 95% of all nodes having a maximum deviation of +/- 2.62 meters, as seen in Figure 13. A detailed graphical overview can be seen in Figure 12. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 14). It was found that 98.70% of nodes are within allowable NOAA uncertainty (Figure 15).H1288120000SNOAA Ship FAIRWEATHER2016SupportFiles\H12865 - H12881 Junction Difference.pngJunctioning surveys H12865 and H12881 with difference surface. Greatest differences are indicated in black and red and occur in rocky/steep areas. SupportFiles\H12865_H12881_16m_Difference.pngStatistical output of difference surface for H12865 and H12881.SupportFiles\H12865 - H12881 NOAA Allowable.pngH12865 junction with H12881 NOAA allowable uncertainty.SupportFiles\H12865 - H12881 NOAA Allowable Statistics.pngH12865 junction with H12881 NOAA allowable uncertainty statistics.Surface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 16 meter combined surface from H12865 and the 16 meter combined surface from H12881. The statistical analysis of the difference surface shows a mean of 0.26 meters with 95% of all nodes having a maximum deviation of +/- 1.76 meters, as seen in Figure 17. A detailed graphical overview can be seen in Figure 16. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 18). It was found that 99.32% of nodes were within allowable NOAA uncertainty (Figure 19).SupportFiles\H12865 Junction Boundaries.pngOverview of H12865 junction surveys.H12865 junctions with two adjacent surveys from this project H12880, H12881, and one survey from project OPR-O190-FA-15: H12744 as shown in Figure 7. Data overlap between all surveys was achieved. These areas of overlap between surveys were reviewed with CARIS HIPS and SIPS by surface differencing (at equal resolutions) to assess surface agreement. The multibeam data were also examined in CARIS Subset Editor for consistency and agreement. The junctions with H12865 are generally within the NOAA allowable uncertainty in their areas of overlap. For all junctions with H12865, a negative difference indicates H12865 was deeper, and a positive difference indicates H12865 was shoaler. SupportFiles\H12865 False Flags from Holiday Finder.pngH12865 apparent holidays in coverage. The numbers in black indicate the number of nodes identified as data gaps.HolidaysH12865 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the 2016 HSSD. Seventy eight apparent holidays which meet the 3 by 3 node definition were identified via Pydro QC Tools Holiday Finder function. This tool automatically scans finalized surfaces for holidays as defined in the HSSD. All flagged areas by Holiday Finder were examined and all apparent holidays were determined to be from areas where an adjoining surface covered the gap (e.g., a holiday in the 2m finalized surface was covered by the 1m finalized surface due to the area being shoaler than the depth range for the 2m surface), as seen in Figure 20. SupportFiles\NOAA Allowable Uncertainty Compliance Overview.pngH12865 NOAA allowable uncertainty overview.SupportFiles\NOAA Allowable Uncertainty Compliance Statistics.pngH12865 NOAA allowable uncertainty statistics.NOAA Allowable UncertaintyTo verify that all data meets the accuracy specifications as stated in HSSD Section 5.1.3, a child layer titled “NOAA_Allowable_1” was created for each of the 1-meter, 2-meter, 4-meter, and 8-meter (72-100m) and "NOAA_Allowable_2" for the 8-meter (100-160m) and 16-m finalized surfaces using the equations stated in Section C. 2.1 of the DAPR. These surfaces were then analyzed using the Pydro QC Tools Grid QA feature to determine what percentage of each surface meets specifications. Figure 21 shows an overview of the NOAA Allowable Uncertainty layers for all surfaces. Figure 22 shows the corresponding statistics for each individual surface. Overall, 99.43% of nodes with all surfaces meet or exceed NOAA Allowable Uncertainty specifications for H12865. For individual graphs per surface of density requirements, see the Standards and Compliance Review located in Appendix II.SupportFiles\H12865 Density Compliance Overview.pngH12865 density overview.SupportFiles\H12865 Density Compliance Statistics.pngH12865 density compliance statistics.DensityFinalized surfaces were analyzed using the Pydro QC Tools Grid QA feature and the results are shown in Figure 24 below. Density requirements for H12865 were achieved with at least 99.50% of finalized surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3. The few nodes that did not meet density requirements are due to sparse data in the outer beams, especially near steep slopes and rocky areas where acoustic shadowing occurred, and at the edges of the survey limits as shown in Figure 23. For individual graphs (per surface) of density requirements, see the Standards and Compliance Review located in Appendix II.None ExistThere were no other factors that affected corrections to soundings.00.02ERS via PMVD00.097Discrete Zoning00TCARI1N/A0.5S220N/A20.52805N/A20.52806N/A20.52807N/A20.52808In addition to the usual a priori estimates of uncertainty provided via device models for vessel motion, discrete zoning tides, ERZT, and PMVD, real-time and post-processed uncertainty sources were also incorporated into the depth estimates of survey H12865. Real-time uncertainties were provided via EM710 and Reson 7125 MBES data, Applanix Delayed Heave RMS, and TCARI tides. Following post-processing of vessel motion, real time uncertainties of vessel roll, pitch, gyro and navigation were applied in CARIS HIPS and SIPS via a Smoothed Best Estimate of Trajectory (SBET) RMS file generated in Applanix POSPac. Sound Speed Cast Frequency: Casts were conducted at a minimum of at least one per every 4 hours during launch acquisition. Casts were conducted more often in areas where the influx of freshwater had an effect on the speed of sound in the water column and when there was a change in surface sound velocity greater than two meters per second. MVP casts on S220 were conducted approximately every 15 minutes as recommend by Pydro CastTime, a software tool that determines optimum cast frequency based on observed sound speed variations. Detailed Sound Speed methods are described in the DAPR.SupportFiles\H12865_Surface_XL_Diff_Overview.pngOverview of H12865 crosslines.SupportFiles\H12865_MB_8m_MLLWvPMVD_XL_Diff.pngH12865 crossline and mainscheme difference statistics.SupportFiles\H12865_Surface_XL_NOAA_Allowed_Overview.pngDepth differences between H12865 mainscheme and crossline data as compared to NOAA allowable uncertainty standard for the associated depths.SupportFiles\H12865_Surface_XL_NOAA_Allowed_Statistics.pngH12865 crossline surface statistics showing percentage of nodes meeting NOAA allowable uncertainty.Crosslines were collected, processed and compared in accordance with Section 5.2.4.3 of the HSSD. To evaluate crosslines, a 16-meter CUBE surface using strictly mainscheme lines, and a 16-meter CUBE surface using strictly crosslines were created. From these two surfaces, a difference surface (mainscheme - crosslines = difference surface) was generated at a 16-meter resolution (Figure 3), and is submitted in the Separates II Digital Data folder. Statistics show the mean difference between the depths derived from mainscheme and crosslines was 0.21 meters (with mainscheme being deeper) with 95% of nodes falling within +/- 2.33 meters (Figure 4). For the respective depths, the difference surface was compared to the allowable NOAA accuracy standards (Figure 5). In total, 94.35% of the depth differences between H12880 mainscheme and crossline data are within allowable NOAA uncertainties (Figure 6).2016-09-30Data Acquisition and Processing Report2016-09-30Horizontal and Vertical Control Report2016-09-30Coast Pilot Report2016-07-15Tides and Water Levels PackageAs 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.The survey data meet or exceed requirements as set forth in the NOS Hydrographic Surveys and Specifications Deliverables Manual, 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.All 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.Chief of PartyCDR Mark Van Waes, NOAA2016-09-30Field Operations OfficerLT Bart Buesseller, NOAA2016-09-30Chief Survey TechnicianHCST Douglas Bravo2016-09-30Sheet ManagerENS Tyler Fifield, NOAA2016-09-30Annette Island, AK (323 kHz)Level Island, AK (295kHz)Differential correctors from the U.S. Coast Guard beacon at Annette Island (323 kHz) and Level Island (295kHz) were used during real-time, and were the sole method of positioning of detached positions (DP) and bottom samples.UTM Zone 8 NorthWorld Geodetic System of 1984 (WGS84)9677LarsonSingle BaseVessel kinematic data were post-processed using Applanix POSPac processing software and Single Base Positioning methods described in the DAPR. Smoothed Best Estimate of Trajectory (SBET) and associated error (RMS) data were applied to all MBES data in CARIS HIPS. For further details regarding the processing and quality control checks performed, see the H12865 POSPAC Processing Logs spreadsheet located in the Separates folder. See also the OPR-O190-FA-16 Horizontal and Vertical Control Report (HVCR), submitted under a separate cover. Hydrographic Technical Directive (HTD) 2016-3, which revises the horizontal datum requirement to NAD83, was released after acquisition was completed for OPR-O190-FA-16. The field unit conferred with HSD-OPS and determined no waiver was required to maintain WGS84 as the datum for submission. This correspondence has been included in Appendix II.Mean Lower Low WaterERS via Poor Mans VDATUMO190FA2016CORP_PMVDERZT_UTM-WGS84-8N_WGS84-MLLW_100m.csarEntrance to Windy Cove9450251Dunbar Inlet Tide Buoy945BBBBPort Alexander, AK9451054Ketchikan, AK9450460Discrete ZoningTCARI2016-06-122016-09-07Final Approved9451054.tidPreliminaryOPRO190CORP.zdfFinalO190FA2016.tcInitial reduction of acquired data to MLLW was accomplished via traditional tidal means using the discrete zoning provided by HSD-OPS. Following the successful application of SBETs and computation of an Ellipsoidally Referenced Zone Tide (ERZT) separation model, ERS methods were used for reducing data to MLLW. After final tides were received, the final Tidal Constituent and Residual Interpolation (TCARI) grids were applied to the data and used for reducing features to MLLW.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.No overhead features exist for this survey.Fairweather personnel conducted limited shoreline verification and reconnaissance, utilizing traditional shoreline methods, at times near predicted negative or low tides within the survey limits. Annotations, information, and diagrams collected on DP forms and boat sheets during field operations are scanned and included in the Separates I Detached Positions folder. Shoreline verification procedures for survey H12865 conform to those detailed in the DAPR. No new surveys or further investigations are recommended for this area.No platforms exist for this survey.No submarine features exist for this survey.No significant features exist for this survey.No present or planned construction or dredging exist within the survey limits.No new insets are recommended for this area.No ferry routes or terminals exist for this survey.No prior survey comparisons exist for this survey.No Aids to Navigation (ATONs) exist for this survey. No shoals or potentially hazardous features exist for this survey other than those addressed in the Dangers to Navigation section above.SupportFiles\H12865 Bottom Sample Locations.pngH12865 bottom sample locationsNine bottom samples were acquired in accordance with the Project Instructions for survey H12865. All bottom samples were entered in the H12865 Final Feature File. See figure 40 for bottom sample locations.40000US5AK4DM22015-05-12false2015-05-12SupportFiles\H12865 ENC Diff.pngH12865 surface difference to US5AK4DM and US5AK4EM.SupportFiles\H12865 ENC Diff Statistics.pngH12865 ENC difference comparison statistics.SupportFiles\H12865 Contour comparison and recommend addition of 20fm contour.pngH12865 surveyed contour overview with ENCs US5AK4DM and US5AK4EM.SupportFiles\H12865 Proposed addition of 20fm contour to US5AK4DM in Breezy Bay.pngH12865 proposed addition of 20fm contour to US5AK4DM in Breezy Bay.SupportFiles\H12865 Recommended Addition of 50fm Contour.pngH12865 recommended update of 50fm contour.The ENCs for this survey area were derived from the RNCs and therefore match for comparisons. The chart comparison between survey H12865 and ENC US5AK4DM showed large areas of disagreement. A difference surface was created from the H12865 16m combined surface and a 16m TIN created from the soundings on ENC US5AK4DM and US5AK4EM (Figure 26). The image below shows that the majority of the ENC is deeper than the surveyed soundings from H12865. Overall, 95% of nodes have a difference of +\- 45.91 meters when compared to the charted depths, as seen in Figure 27. Contours from H12865 are in a general agreement with charted contours on ENC US5AK4DM with the exception of the missing 20 fathom, 50 fathom and 100 fathom contours. See Figures 28, 29, and 30 for examples. These contours are present in US5AK4EM and simply do not extend north into US5AK4DM. The Hydrographer recommends adding these contours to ENC US5AK4DM as to provide continuity to the mariner.40000US5AK4EM12015-05-14false2015-05-14SupportFiles\H12865 Recommended addition of 20fm and 50fm contours to US5AK4EM north of Reef Point.pngH12865 proposed update of 20fm and 50fm contour to US5AK4EM north of Reef Point.As discussed under ENC US5AK4DM and shown in Figure 26 above, while individual soundings may match within 1-2fm, the overall chart comparison between survey H12865 and ENC US5AK4EM showed large and varying areas of disagreement. Contours from H12865 are in a general agreement with charted contours on ENC US5AK4EM as shown in Figure 31. The largest differences are the lack of accuracy in the the 20 fathom and 50 fathom charted contours. The Hydrographer recommends updating these contours to ENC US5AK4EM as to provide additional information to the mariner.2726400002016-07-262016-07-1916174072014-12The charted soundings and contours of Chart 17407 are identical to those found on ENC US5AK4DM. As such, all discussions regarding comparisons between surveyed soundings and charted depths are covered under the ENC US5AK4DM discussion below. 2727400002016-07-262016-07-199174082014-12The charted soundings and contours of Chart 17408 are identical to those found on ENC US5AK4EM. As such, all discussions regarding comparisons between surveyed soundings and charted depths are covered under the ENC US5AK4EM discussion below.No maritime boundary points were assigned for this survey.No channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits.2016-09-26H12865 DTON Report1SupportFiles\H12865 DTON Overview.pngH12865 Chart 17407 location of DTONS.SupportFiles\1 Fathom NW Sentinels DTON 3D View.pngH12865 1.8fm DTON 3D subset view.SupportFiles\1 Fathom S Sentinels.pngH12865 1.4fm DTON 3D subset view.SupportFiles\2 Fathom Between Sentinels and Nichols Is DTON 3D View.pngH12865 2.6fm DTON 3D subset view.SupportFiles\2 Fathom NE Sentinels DTON 3D View.pngH12865 2.6fm DTON 3D subset view.SupportFiles\2 Fathom SW Sentinels DTON 3D View.pngH12865 2.6fm DTON 3D subset view.SupportFiles\5 Fathom NW Nichols Is DTON 3D View.pngH12865 5.6fm DTON 3D subset view.SupportFiles\6 Fathom Between Sentinels and Nichols Is DTON 3D View.pngH12865 6.6fm DTON 3D subset view.Seven Dangers to Navigation (DTONs) were found within the limits of survey H12865, and were reported to the Marine Chart Division on September 26, 2016. All seven Dangers to Navigation exist in the vicinity of The Sentinels and northern Nichols Island. This area was poorly charted and numerous shoals were discovered near significantly deeper charted depths as shown in Figure 32. The Danger to Navigation Report is included in Appendix II of this report.A comparison was performed between survey H12865 and charts 17407 and 17408 as well as ENC US5AK4DM, and US5AK4EM using CARIS HIPS and SIPS sounding and contour layers derived from the 16m combined surface. The contours and soundings were overlaid on the charts to assess differences between the surveyed soundings and charted depths. ENCs were compared to a 16m combined grid by extracting all soundings from the chart and creating a TIN which was differenced to the combined surface. All data from H12865 should supersede charted data. In general, surveyed soundings do not agree with the majority of charted depths. A full discussion of the disagreements follows below.Survey H12865 has 69 new features that are addressed in the H12865_Final_Feature_File. All assigned features were addressed and are included in the H12865_Final_Feature_File. Vicinity of Nichols IslandsAlaska1United States20000H12865NOAA2016CDR Mark Van Waes, NOAA2016-06-112016-05-07Navigable Area2016-03-28metersMultibeam Echo Sounder BackscatterMultibeam Echo SounderUniversal Transverse Mercator (UTM)Pacific Hydrographic BranchUTCOPR-O190-FA-16West of Prince of Wales IslandWest of Prince of Wales IslandNOAA Ship FAIRWEATHERData for survey H12865 were acquired to the survey limits in accordance with the requirements in the Project Instructions and the NOS Hydrographic Surveys Specifications and Deliverables (HSSD) dated March 2016, as shown in Figure 1. In all areas where the 4-meter depth contour or the sheet limits were not met, the Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry due to the risks of maneuvering the survey vessel in close proximity to the steep and rocky shoreline. The purpose of this project is to provide contemporary surveys to update National Ocean Service (NOS) nautical charting products. Survey areas will address 16 SNM of navigationally significant waters in accordance with the National Hydrographic Survey Priorities, 2012 Edition.The entire survey is adequate to supersede previous data.Data acquired in H12865 meet multibeam echo sounder (MBES) coverage requirements for complete coverage, as required by the HSSD. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). Additional compliance statistics can be found in the Standards and Compliance Review located in the Separates Folder.SupportFiles\H12865_SheetLimits.pngH12865 survey coverage.Complete coverage MB with backscatter (Section 5.2.2.3) or Set Line Spacing at 100 meters (Section 5.2.2.4).Inshore limit to 8 meters water depthComplete Coverage MBES with Backscatter. Refer to HSSD Section 5.2.2.3Greater than 8 meters water depthThe entirety of H12865 was acquired with complete coverage MBES with backscatter, meeting the requirements listed above and in the HSSD. See Figure 2 for an overview of coverage.133.11225413955.2106613889132.93885366755.0856436389SupportFiles\H12865_Survey_Outline.pngH12865 sheet limits.The survey area is located along the West coast of Prince of Wales Island, within the sub-locality of Nichols Islands.0000001039.04S22000000024.910118.5428050000001042.9128060000001043.9328070000001053.0528080000008.3724.910297.462016-05-102016-05-142016-05-152016-05-172016-05-182016-05-252016-05-272016-06-092016-06-1218.9326091