Chart 18748 Notes Flashcards
Aids to Navigation
Consult U.S. Coast guard light list for supplemental information concerning aids to navigation.
Authorities
Hydrography and topography by the National Ocean Service, Coast Survey, with additional data from the Corps of Engineers, Geological Survey, and U.S. Coast Guard.
Caution 1
Temporary changes or defects in aids to navigation are not indicated on this chart. See Local Notice to Mariners.
Caution 2
Limitations on the use of radio signals as aids to marine navigation can be found in the US Coast Guard Light Lists and NGIA publication 117.
Radio direction finder bearings to commercial broadcasting stations are subject to error and should be used with caution.
Station positions are shown thus:
(Accurate location) (Approximate location)
Caution 3
Submarine pipelines and cables
Charted submarine pipelines and submarine cables and submarine pipeline and cable areas are shown as:
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 trolling.
Covered wells may be marked by lighted or unlighted buoys.
Heights
Heights in feet above Mean High Water.
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.
Note A
Navigation regulations are published in Chapter 2, US Coast Pilot 7. Additions or revisions to Chapter 2 are published in the Notice to Mariners. Information concerning the regulations may be obtained at the Office of the Commander, 11th Coast Guard district in Alameda, California or at the Office of the District Engineer, Corps of Engineers in Los Angeles, California.
Refer to charted regulation section numbers.
Note B
The city of Los Angeles advises that under certain tidal conditions, underwater installations between King Harbor and Marina Del Rey, seaward to 9 fathom depths, present possible hazards to surface navigation.
Note C
Mariner activated sound signal (MRASS).
Horn is activated by keying the mic 5 times on VHF-FM channel 81A. Horn will operate for 30 minutes.
Note G
Numerous submerged pipelines, sewer lines, uncharted buoys and other potential hazards to navigation exist with in this area. Anchoring, dredging, seining, fishing and similar activities within this area made foul, rupture or otherwise disturb the submerged pipelines, risking severe environmental damage. If circumstances necessitate a transit through this region, proceed by the most direct route without undue delay and extreme caution, as there are numerous unlighted buoys.
Pollution Reports
Report all spills of oil and hazardous substances to the national response center via 1-800-424-8802, or to the nearest US Coast Guard facility if telephone communication is impossible (33 CFR 153).
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.
Supplemental Information
Consultant US coast pilot 7 for important supplemental information.
Source Diagram
The outlined areas represent the limits of the most recent hydrographic survey information that has been evaluated for charting. Surveys have been banded at this diagram by date and type of survey. Channels maintained by the US Army Corps of Engineers are periodically re-surveyed and are not shown on this diagram. Refer to Chapter 1, United States Coast Pilot.
