NOAA ENCŪ NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION US2ARCDD - BRISTOL BAY AND SHELIKOF STRAIT, AK INDEX: NOTE A AIDS TO NAVIGATION POLLUTION REPORTS CAUTION - USE OF RADIO SIGNALS (LIMITATIONS) SUPPLEMENTAL INFORMATION CAUTION - TEMPORARY CHANGES WARNING - PRUDENT MARINER ADDITIONAL INFORMATION AUTHORITIES CAUTION - HYDROGRAPHIC CAUTION - MARINERS CAUTION - USACE HYDROGRAPHIC SURVEYS CAUTION - QUALITY OF BATHYMETRIC DATA CAUTION - SIGNIFICANT CHANGES CAUTION - SUBMARINE PIPELINES AND CABLES CAUTION - TIDAL COLREGS, 80.1705 (see note A) NOAA WEATHER RADIO BROADCASTS RADAR REFLECTORS WATER LEVELS, CURRENTS, AND TIDES COMMENTS REQUESTED NOTES: NOTE A Navigation regulations are published in Chapter 2 of each regional U.S. Coast Pilot. Additions or revisions to Chapter 2 are published in the Notice to Mariners. Information concerning the regulations may be obtained from the Coast Guard District Commander. Refer to charted regulation section numbers. AIDS TO NAVIGATION Consult U.S. Coast Guard Light List for supplemental information concerning aids to navigation. POLLUTION REPORTS Report all spills of oil and hazardous substances to the National Response Center via 1-800-424-8802 (toll free), or to the nearest U.S. Coast Guard facility if telephone communication is impossible (33 CFR 153). CAUTION - USE OF RADIO SIGNALS (LIMITATIONS) Limitations on the use of radio signals as aids to marine navigation can be found in the U.S. Coast Guard Light Lists and National Geospatial-Intelligence Agency Publication 117. Radio direction-finder bearings to commercial broadcasting stations are subject to error and should be used with caution. SUPPLEMENTAL INFORMATION Consult U.S. Coast Pilot 9 for important supplemental information. CAUTION - TEMPORARY CHANGES Temporary changes or defects in aids to navigation are not indicated. See Local Notice to Mariners. WARNING - PRUDENT MARINER The prudent mariner will not rely solely on any single aid to navigation, particularly on floating aids. See U.S. Coast Guard Light List and U.S. Coast Pilot for details. ADDITIONAL INFORMATION Additional information can be obtained at www.nauticalcharts.noaa.gov. AUTHORITIES Hydrography and topography by the National Ocean Service, Coast Survey, with additional data from the Corps of Engineers, Geological Survey, U.S. Coast Guard, and National Geospatial-Intelligence Agency. CAUTION - HYDROGRAPHIC Hydrographic details and aids to navigation are not generally shown where larger scale coverage is available. CAUTION - MARINERS Mariners are urged to use caution when navigating in the area of this chart. Significant changes in depths and shoreline may have occurred as a result of the earthquake of March 27, 1964. The magnitude of change is known only at selected sites which are indicated by note on the larger scale charts. CAUTION - USACE HYDROGRAPHIC SURVEYS USACE conducts hydrographic surveys to monitor navigation conditions. These surveys are not intended to detect underwater features. Undetected features hazardous to surface navigation may exist in federal channels, as might shoaling, particularly along the edges of channels. For more information visit https://navigation.usace.army.mil/Survey/Hydro/ . CAUTION - QUALITY OF BATHYMETRIC DATA The areas represented by the object M_QUAL (Quality of Data) are approximate due to generalizing for clarity. Caution is advised, particularly for nearshore navigation or voyage planning. M_QUAL represents areas of uniform quality of bathymetric data. The CATZOC (Category of Zone of Confidence in Data) attribute of M_QUAL provides an assessment of the overall zone of confidence. CAUTION - SIGNIFICANT CHANGES Significant changes in depths and shoreline may have occurred in the area of chart as a result of the earthquake of March 27, 1964. Tidal observations since the earthquake indicate bottom uplift of +0.3 feet at King Cove, Alaska Peninsula and bottom subsidence of -0.2 feet of Chignick Bay, Alaska Peninsula. Observations at Sand Point, Popof Island, Indicated there was no change at that location. Mariners are urged to use extreme caution when navigating in the area of this chart as the magnitude of change except at these sites is not known. CAUTION - SUBMARINE PIPELINES AND CABLES Additional uncharted submarine pipelines and submarine cables may exist within the area of this chart. Not all submarine pipelines and submarine cables are required to be buried, and those that were originally buried may have become exposed. Mariners should use extreme caution when operating vessels in depths of water comparable to their draft in areas where pipelines and cables may exist, and when anchoring, dragging, or trawling. Covered wells may be marked by lighted or unlighted buoys. CAUTION - TIDAL Tidal observations made by the National Ocean Service since the earthquake of March 27, 1964, indicate bottom uplift or subsidence at the following locations: Chignik Bay, Alaska Pen. -0.2 feet / -0.06 meters Sand Pt, Popof Island 0 feet / 0 meters King Cove, Alaska Pen. +0.3 feet / +0.09 meters Mariners are cautioned to expect shoaling or deepening for the areas listed. Tidal observations at this time are selected sites and the magnitude of the changes except at these sites is not known. COLREGS, 80.1705 (see note A) International Regulations for Preventing Collisions of Sea, 1972. The entire area falls seaward of the COLREGS Demarcation Line. NOAA WEATHER RADIO BROADCASTS The NOAA Weather Radio stations listed below provide continuous weather broadcasts. The reception range is typically 20 to 40 nautical miles from the antenna site, but can be as much as 100 nautical miles for stations at high elevations. Bede Mountain, AK WNG-528 162.450 MHz Bethel, AK WNG-675 162.550 MHz Cape Gull, AK WNG-529 162.500 MHz Dillingham, AK WNG-681 162.500 MHz Middle Cape, AK WZ-2556 162.525 MHz Raspberry Island, AK KZZ-90 162.425 MHz Tuklung Mtn., AK WNG-525 162.425 MHz RADAR REFLECTORS Radar reflectors have been placed on many floating aids to navigation. Individual radar reflector identification on these aids has been omitted from this chart. WATER LEVELS, CURRENTS, AND TIDES Real-time water levels, tide predictions, and tidal current predictions are available on the internet from NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) at https://tidesandcurrents.noaa.gov/water_level_info.html and https://tidesandcurrents.noaa.gov/currents_info.html. COMMENTS REQUESTED NOAA encourages users to submit inquiries, discrepancies, or comments about this chart via NOAA's ASSIST tool at https://www.nauticalcharts.noaa.gov/customer-service/assist/. END OF FILE