NOAA ENCŪ NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION US5AK1MK - GLACIER BAY, 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 - GLACIAL INLETS CAUTION - GLACIERS AND ICEBERGS CAUTION - QUALITY OF BATHYMETRIC DATA COLREGS, 80.1705 RADAR REFLECTORS WATER LEVELS, CURRENTS, AND TIDES COMMENTS REQUESTED NOTES: NOTE A Navigation regulations are published in Chapter 2, U.S. Coast Pilot 8. Additions or revisions to Chapter 2 are published in the Notices to Mariners. Information concerning the regulations may be obtained at the Office of the Commander, 17th Coast Guard District in Juneau, Alaska, or at the Office of the District Engineer, Corps of Engineers in Anchorage, Alaska. 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 8 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 U.S. Coast Guard, Geological Survey, and National Park Service. CAUTION - GLACIAL INLETS Mariners use caution when navigating near the heads of glacial inlets. Heads of glacial inlets are highly changeable. CAUTION - GLACIERS AND ICEBERGS Tidewater glaciers should not be approached closer than 0.5 miles / 0.8 kilometers. Large icefalls create waters dangerous to boats, particularly when near shore or close to bergs. Great pieces of submerged ice attached to the glacier may shoot to the surface hundreds of yards / meters from the face. Shoaling may also exist in these areas due to high rates of sediment deposition. Icebergs should be given a wide berth; approximately 5/6 of the berg is under water and a submerged shelf may be protruding. Icebergs continually melt, sometimes turning over suddenly without warning. 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. COLREGS, 80.1705 International Regulations for Preventing Collisions at Sea, 1972.The entire area of this chart falls seaward of the COLREGS Demarcation Line. 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