OPR-P335-FA-16South Coast of Kodiak IslandSouth Coast of Kodiak IslandNOAA Ship FAIRWEATHERH128983South of Cape KaguyakAlaskaUnited States400002016CDR Mark Van Waes, NOAANavigable Area2016-06-132016-06-242016-07-30Multibeam Echo SounderSide Scan SonarmetersUTM-WGS 84UTCPacific Hydrographic BranchThe purpose of this survey is to provide contemporary surveys to update National Ocean Service (NOS) nautical charts. All separates are filed with the hydrographic data. Any revisions to the Descriptive Report (DR) generated during office processing are shown in bold, red italic text. The processing branch maintains the DR as a field unit product, therefore, all information and recommendations within the body of the DR are considered preliminary unless otherwise noted. The final disposition of surveyed features is represented in the OCS nautical chart update products. All pertinent records for this survey, including the DR, are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via http:// www.ncei.noaa.gov/.NOAAThe survey area is located on the Southern Coast of Kodiak Island within the sublocality of Southern Cape Kaguyak.56.9131410556153.77478122256.7478025833153.438436278H12898 Sheet Limits (in blue) overlaid onto Charts 16590 and 16592.SupportFiles\Sheet Limits.PNGSurvey limits were acquired in accordance with the requirements in the Project Instructions and the HSSD.The purpose of this project is to provide contemporary surveys to update National Ocean Service (NOS) nautical charting products. Survey area will address 43 square nautical miles of navigationally significant water. This survey will also support seismic research for tsunami risk analysis by United States Geological Survey (USGS) and Alaska Department of Fish and Game (ADF&G). The entire survey is adequate to supersede previous data.Data acquired in H12898 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 Appendix II of this report.Greater than 8 meters water depthComplete Coverage MBES with Backscatter. Refer to HSSD Section 5.2.2.3.The entirety of H12898 was acquired with complete coverage MBES depth and Backscatter data meeting the requirements listed above and in the HSSD, see Figure 2 for an overview of coverage. H12898 survey coverage (8m surface) overlaid onto Charts 16590 and 16592 with 5x vertical exaggeration.SupportFiles\Survey Coverage.PNGS2200496.070000015.4202805010.340000014.5000506.400000029.9306.0400042.812016-06-242016-06-252016-07-062016-07-072016-07-102016-07-112016-07-142016-07-152016-07-162016-07-172016-07-182016-07-192016-07-202016-07-212016-07-282016-07-292016-07-302016-07-31Refer 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.S22070.404.8828058.641.12KongsbergEM710MBESRESON7125MBESApplanixPOS/MVPositioning and Attitude SystemSeabirdSBE 19PlusConductivity, Temperature, and Depth SensorRolls RoyceMVP 200Conductivity, Temperature, and Depth SensorRESONSVP70Sound Speed SystemRESONSVP71Sound Speed SystemCrosslines were collected, processed and compared in accordance with section 5.2.4.3 of the HSSD. To evaluate crosslines, an 8 meter CUBE surface using strictly mainscheme lines, and an 8 meter CUBE surface using strictly crosslines were created. From these two surfaces, a difference surface (mainscheme - crosslines = difference surface) was generated at an 8 meter resolution (see 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 -0.02 meters (mainscheme being shoaler) with a 95% of nodes falling within +/- 0.27 meters (Figure 4). For the respective depths, the difference surface was compared to the allowable NOAA accuracy standards (Figure 5). In total, 99.93% of the depth differences between H12898 mainscheme and crossline data are within allowable NOAA uncertainties (Figure 6).Overview of H12898 crosslines.SupportFiles\Crossline Diff.PNGH12898 crossline and mainscheme difference statistics.SupportFiles\H12898_Crossline_Diff.pngDepth differences between H12898 mainscheme and crossline data as compared to NOAA allowable uncertainty standards for the associated depths.SupportFiles\NOAA Allowable Uncertainty XL Overview.PNGH12898 crossline surface statistics showing percentage of nodes meeting NOAA allowable uncertainty.SupportFiles\H12898 Crossline Differencing NOAA Allowable Uncertainty Stats.png00TCARI00.02ERS via PMVD28052N/A0.5S220N/A10.5Real-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 are applied in CARIS HIPS and SIPS via an Smoothed Best Estimate of Trajectory (SBET) RMS file generated in Applanix POSPac.H12898 junctions with two adjacent surveys from this project, H12897, H12910, and one survey from a prior project, H12686, as shown in Figure 7. Data overlap between H12898 and each adjacent survey was achieved. These areas of overlap between surveys were reviewed in 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 H12898 are within the NOAA allowable uncertainty in their areas of overlap. For all junctions with H12898, a negative difference indicates H12898 was shoaler, and a positive difference indicates H12898 was deeper.Overview of H12898 junction surveys.SupportFiles\Overview of Junction Surveys.PNGH12897400002016NOAA Ship FAIRWEATHERSWSurface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 8 meter combined surface from H12898 and the 8 meter combined surface from H12897. The statistical analysis of the difference surface shows a mean of -0.02 meters with 95% of all nodes having a maximum deviation of +/- 0.23 meters, as seen in Figure 9. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 10). It was found that 99.95% of nodes are within NOAA allowable uncertainty (Figure 11).Difference surface between H12898 and junctioning survey H12897.SupportFiles\H12897 Junction Diff Graphic.PNGDifference surface statistics between H12898 and H12897 (8 meter surface).SupportFiles\H12898 - H12897 Junction Comparison.pngDifference surface compliance with regard to NOAA allowable uncertainty between H12898 and junctioning survey H12897.SupportFiles\H12897 Diff NOAA Allowable Uncertainty Graphic.PNGH12898 junction with H12897 NOAA allowable uncertainty statistics.SupportFiles\H12898 and H12897 NOAA Allowable Uncertainty Statistics.pngH12686400002014NOAA Ship FAIRWEATHERNSurface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 8 meter combined surface from H12898 and the 8 meter combined surface from H12686. The statistical analysis of the difference surface shows a mean of -0.11 meters with 95% of all nodes having a maximum deviation of +/- 0.30 meters, as seen in Figure 13. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 14). It was found that 99.95% of nodes are within NOAA allowable uncertainty (Figure 15).Difference surface between H12898 and junctioning survey H12686.SupportFiles\H12686_Junction Diff Graphic.PNGDifference surface statistics between H12898 and H12686 (8 meter surface).SupportFiles\H12898 - H12686 Junction Comparison.pngDifference surface compliance with regard to NOAA allowable uncertainty between H12898 and junctioning survey H12686.SupportFiles\H12686 Diff NOAA Allowable Uncertainty Graphic.PNGH12898 junction with H12686 NOAA allowable uncertainty statistics.SupportFiles\H12898 and H12686 NOAA Allowable Uncertainty Statistics.pngH12910400002016NOAA Ship FAIRWEATHERNESurface differencing in CARIS HIPS and SIPS was used to assess junction agreement between the 8 meter combined surface from H12898 and the 8 meter combined surface from H12910. The statistical analysis of the difference surface shows a mean of 0.22 meters with 95% of all nodes having a maximum deviation of +/- 0.38 meters, as seen in Figure 17. In addition, a comparison surface was created between the difference surface and the NOAA allowable uncertainty (See Figure 18). It was found that 100.00% of nodes are within NOAA allowable uncertainty (Figure 19).Difference surface between H12898 and junctioning survey H12910.SupportFiles\H12910 Junction Diff Graphic.PNGDifference surface statistics between H12898 and H12910 (8 meter surface).SupportFiles\H12898 - H12910 Junction Comparison.pngDifference surface compliance with regard to NOAA allowable uncertainty between H12898 and junctioning survey H12910.SupportFiles\H12910 Diff NOAA Allowable Uncertainty Graphic.PNGH12898 junction with H12910 NOAA allowable uncertainty statistics.SupportFiles\H12898 and H12910 NOAA Allowable Uncertainty Statistics.pngSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.Sea StateDuring acquisition on H12898 multiple weather events occurred off the coast of Kodiak Island causing large swell conditions in the working area. The greatest affected days were day numbers 196 and 197. Due to the sea conditions as well as currents in the project area, S220 experienced hard pitching when surveying into seas and swell. In many cases, the pitching caused the Kongsberg EM-710 to experience "blow outs" where the sonar periodically lost bottom track, producing significant noise across the swath. These data were examined by the Hydrographer in CARIS Subset Editor and the spurious soundings were flagged as "rejected" in order to allow the surface to more accurately represent the seafloor. (Figure 20).Example of DN196 sea state.SupportFiles\DN196 Sea State_3.PNGSound SpeedMultiple instances of sound speed artifacts were observed within the data when viewed at high exaggeration. The majority of these artifacts were seen at the extents of the outer beams where sea state compounded sound speed uncertainties causing small ripples to be visible within the surfaces at high levels of exaggeration. Numerous spot-checks in CARIS Subset Editor showed all areas to be well within NOAA allowable uncertainties. The most significant sound speed artifact within the survey was found in the northeastern portion of the survey area near Twoheaded Island (see Figure 21). Upon investigation it was determined that the sound speed cast applied to the line was not representative for the full extents of the line, causing some limited “frowning” at the eastern extents of the line. No other temporally adjacent casts were available to apply to the data and the Hydrographer flagged all erroneous data below the true seafloor as “rejected” (Figure 22). The resulting surfaces are within NOAA allowable uncertainties and remain adequate to supersede previous data. Example of effects of incorrect sound speed impacting surface.SupportFiles\H12898 SV Issue.pngSubset of surface shown in Figure 21 showing "frowns" in data caused by sound speed issues (20x vertical exaggeration).SupportFiles\H12898 Cute Arrows.pngCasts were conducted at a minimum of one every 2 hours during launch acquisition. MVP casts on S220 were conducted at an average interval of 15 minutes as recommended by Pydro’s CastTime software, which determines optimum cast frequency based on the observed sound speed variations from previous casts. All sound speed methods were used as detailed in the DAPR. On DN211, the MVP towfish was lost while towing at the docked position due to a sudden material failure of the MVP cable. In order to continue survey operations, static CTD casts were performed with a SeaBird 19plus CTD. The maximum time between casts was 30 minutes for this period, which is in accordance with HSSD Section 5.2.3.All equipment and survey methods were used as detailed in the DAPR.HolidaysH12898 data were reviewed in CARIS HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. No true holidays which meet the 3 by 3 node definition were identified via Pydro QC Tools Holiday Finder tool. This tool automatically scans finalized surfaces for holidays as defined in the HSSD and was run in conjunction with a visual inspection of all surfaces by the Hydrographer. Although numerous apparent holidays were flagged by Holiday Finder, all were examined and all were determined to be areas where an adjoining finalized surface covered the gap (e.g. a holiday in the 4m finalized surface was covered by the 2m finalized surface due to the area being shoaler than the depth range for the 4m surface) as shown in figure 23.H12898 apparent holidays in coverage.SupportFiles\H12898 False Flags from Holiday Finder.pngNOAA 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 2-meter, 4-meter, and 8-meter (72-100m) and "NOAA_Allowable_2" for the 8-meter (100-160m) 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 24 shows an overview of the NOAA Allowable Uncertainty layers for all surfaces. Figure 25 shows the corresponding statistics for each individual surface. Overall, 98.91% of nodes with all surfaces meets or exceeds NOAA Allowable Uncertainty specifications for H12898. For individual graphs per surface of density requirements, see the Standards and Compliance Review located in Appendix II.H12898 Allowable Uncertainty Overview.SupportFiles\NOAA Allowable Uncertainty Overview.PNGH12898 NOAA Allowable Uncertainty Statistics.SupportFiles\H12898 NOAA Allowable Uncertainty Statistic Updateds.pngDensityFinalized surfaces were analyzed using the Pydro QC Tools Grid QA feature and the results are shown in Figure 26 below. Density requirements for H12898 were achieved with at least 99.98% of finalized surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3. For individual graphs (per surface) of density requirements, see the Standards and Compliance Review located in Appendix II.H12898 Density Compliance Overview.SupportFiles\Density Coverage.PNGH12898 Density Compliance Statistics.SupportFiles\H12898 Density Statistics Update.PNGAll data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Raw Backscatter was logged as .7k file for Reson 7125 data and within the .all file for Kongsberg EM710 data. The data were submitted to Pacific Hydrographic Branch for processing. One line per vessel per day of backscatter was processed by the field unit for quality control.Teledyne CARISHIPS and SIPS9.1QPSFledermaus FMGT7.5.3NOAA Profile version 5.4.H12898_MB_2m_MLLWCUBE2NOAA_2mComplete MBESH12898_MB_4m_MLLWCUBE4NOAA_4mComplete MBESH12898_MB_8m_MLLWCUBE8NOAA_8mComplete MBESH12898_MB_2m_MLLW_FinalCUBE21840NOAA_2mComplete MBESH12898_MB_4m_MLLW_FinalCUBE43680NOAA_4mComplete MBESH12898_MB_8m_MLLW_FinalCUBE872160NOAA_8mComplete MBESThe NOAA CUBE parameters defined in the HSSD were used for the creation of all CUBE surfaces in Survey H12898. 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 by the Hydrographer 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 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.Data LogsData acquisition and processing notes are included in the acquisition and processing logs, and additional processing such as final tide and sound speed application are noted in the H12898 Data Log spreadsheet. All data logs are submitted digitally in the Separates I folder.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterKodiak Island9457292Alitak9457804Offshore Sitkalidak Island GPS Buoy945AAAAOffshore Geese Island GPS Buoy945BBBBTCARI9457292.tidVerified Observed9457804.tidVerified ObservedP335FA2016_Verified.tcPreliminary2016-07-312016-12-02Initial reduction of acquired data to MLLW was accomplished via traditional tidal means using the Tidal Constituent And Residual Interpolation (TCARI) grid 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. As ERS methods were successful for the reduction to MLLW, final tides were not necessary for H12898. As processing was completed prior to receiving final tides, a waiver was obtained from HSD-OPS for the submission of H12898 without final tides applied. This correspondence has been included in Appendix II, accompanying this submission.The GPS Buoy Station IDs are not correct in Table 13. Their working IDs in the project were as follows: Offshore Sitkalidak Island GPS Buoy is TMB230; Offshore Geese Island GPS Buoy is TMB320.ERS via Poor Mans VDATUMP335FA2016_PMVD_UTM-NAD83-5N_WGS84-MLLW_Composite.csarERS methods were used as the final means of reducing H12898 to MLLW for submission. Data were initially reduced via traditional tidal means until an ERZT separation model could be calculated. This empirically derived model was then checked for consistency and compared to the Poor Man’s VDatum (PMVD) separation model provided with the Project Instructions. The PMVD separation model was then vertically shifted such that the average difference between these two separation models is zero. This vertical shift de-biases the PMVD separation model, correcting for local offsets that cannot be effectively modeled by the PMVD. In areas where the PMVD model did not have sufficient coverage such as near shore areas, the ERZT separation model was appended to the PMVD model creating the composite ERZT/PMVD separation model listed above and used to reduce H12898 to MLLW. For further information see the ERS Capability Memo, submitted under separate cover. World Geodetic System of 1984 (WGS84)UTM Zone 5 NorthSingle BaseAC34Old HarborAC45Sitkinak Island9677PZ 2014Vessel 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 H12898 POSPAC Processing Logs spreadsheet located in the Separates folder. See also the OPR-P335-FA-16 Horizontal and Vertical Control report, submitted under separate cover. Hydrographic Technical Directive (HTD) 2016-3, which revises the horizontal datum requirement to NAD83, was released after PIs had been issued and acquisition commenced on OPR-P335-FA-16. The field unit conferred with HSD-OPS and determined no waiver was needed to maintain WGS84 as the datum for submission. This correspondence has been included in Appendix II.Kodiak, AK (313kHz)Differential correctors from the US Coast Guard beacon at Kodiak, AK (313kHz) were used in real-time during acquisition when not otherwise noted in the acquisition logs, and were the sole method of positioning of bottom samples. A comparison was performed between survey H12898, and Charts 16590 and 16592, as well as ENCs US5AK5LM and US5AK5NM, using CARIS HIPS and SIPS sounding and contour layers derived from the 8 meter combined surface. The contours and soundings were overlaid on the chart to assess differences between the surveyed soundings and charted depths. To more accurately visualize trends within these differences, an 8 meter TIN surface was interpolated from the ENC sounding layer. This surface was then differenced with a corresponding 8 meter surface from H12898 and visualized in Figure 28. In this difference surface red colors indicate H12898 was shoaler than the ENC US4AK5LM, green colors indicate agreement, and blue colors indicate H12898 was deeper than ENC US4AK5LM. All data from H12898 should supersede charted data. In general, surveyed soundings agree with the majority of charted depths.Difference surface between H12898 and interpolated TIN surface from US4AK5LM and US4AK5NM.SupportFiles\US4AK5LM and US4AK5NM - 8m_Diff.PNG16590254881529122014-092016-02-162016-02-20The charted soundings and contours of Chart 16590 are identical to those found on ENC US4AK5LM and US4AK5NM. As such, all discussions regarding comparisons between surveyed soundings and charted depths are covered under the ENC's US4AK5LM and US4AK5NM discussions below.16592255080728112014-072016-02-162016-02-20The charted soundings and contours of Chart 16592 are identical to those found on ENC US4AK5LM and US4AK5NM. As such, all discussions regarding comparisons between surveyed soundings and charted depths are covered under the ENC's US4AK5LM and US4AK5NM discussions below.US4AK5LM8152992015-10-272015-10-27falseSoundings from H12898 are in general agreement with charted depths on ENC US4AK5LM, with most depths agreeing within 1-2 fathoms. The statistical analysis of the difference surface shows a mean of 0.02 meters with 95% of all nodes having a maximum deviation of +/- 25.92 meters, as seen in Figure 29. Contours from H12898 are in general agreement with charted contours on ENC US4AK5LM as shown in Figure 30. The largest differences are seen in the offshore 30 fathom contour line, where surveyed and charted contours differ by over 600 meters as seen in Figure 31. Difference surface statistics between H12898 and interpolated TIN surface from US4AK5LM.SupportFiles\US4AK5LM-8m Difference Statistics.pngH12898 surveyed contour overview with ENCs US4AK5LM and US4AK5NM.SupportFiles\H12898 Surveyed Contour Overview.pngH12898 proposed update of 20fm and 30fm contoursSupportFiles\H12898 Contour Discrepency ENC US4AK5LM.pngUS4AK5NM80728102015-11-192015-11-19falseSoundings from H12898 are in general agreement with charted depths on ENC US4AK5NM, with most depths agreeing within 1-2 fathoms. The largest differences are seen in the southeast corner of the surveyed area where differences range to 9 fathoms as seen in Figure 33. The statistical analysis of the difference surface shows a mean of -5.07 meters with 95% of all nodes having a maximum deviation of +/- 9.95 meters, as seen in Figure 32. Contours from H12898 are in general agreement with charted contours on ENC US4AK5NM as shown in Figure 30. Furthermore, the Hydrographer recommends that 20 fathom and 30 fathom contours be added to ENC US4AK5NM to provide additional information to the mariner as shown in Figure 34. Difference surface statistics between H12898 and interpolated TIN surface from US4AK5NM.SupportFiles\US4AK5NM-8m Difference Statistics.pngH12898 sounding discrepancy between surveyed soundings and ENC US4AK5NM in fathoms.SupportFiles\H12898 Sounding Discrepency.pngH12898 recommend addition of and 20fm, 30fm, and 50fm contour onto ENC US4AK5NM.SupportFiles\H12898 Contour Discrepency ENC US4AK5NM.pngNo Maritime Boundary Points were assigned for this survey.No charted features exist for this survey.No uncharted features exist for this survey.No Danger to Navigation Reports were submitted for this survey.No shoals or potentially hazardous features exist 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.Four bottom samples were acquired in accordance with the Project Instructions for survey H12898. One of the four samples returned no good sample after repeated attempts. The remaining three samples returned good results. All were entered in the H12898 Final Feature File. See Figure 35 for location overview.H12898 Bottom Sample Location Overview.SupportFiles\Bottom Samples.PNGShoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.No prior survey comparisons were assigned for this survey.No Aids to navigation (ATONs) exist for this survey.No overhead features exist for this survey.No submarine features exist for this survey.No ferry routes or terminals exist for this survey.No platforms 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 surveys or further investigations are recommended for this area.No new insets are recommended for this area.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.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.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, except as noted in this Descriptive Report. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required unless otherwise noted herein.CDR Mark Van Waes, NOAAChief of Party2016-11-21LT Bart Buesseler, NOAAField Operations Officer2016-11-21HCST Douglas BravoChief Survey Technician2016-11-21ENS Tyler Fifield, NOAASheet Manager2016-11-21Coast Pilot Report2016-11-10Data Acquisition and Processing Report2016-11-08Horizontal and Vertical Control Report2016-11-14