RADIO AIDS TO MARINE NAVIGATION - Canadian Coast Guard
RADIO AIDS TO MARINE NAVIGATION - Canadian Coast Guard
RADIO AIDS TO MARINE NAVIGATION - Canadian Coast Guard
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DIFFERENTIAL GLOBAL POSITIONING SYSTEM (DGPS)<br />
Since May 2000, Full Operational Service (FOS) of the <strong>Canadian</strong> <strong>Coast</strong> <strong>Guard</strong> DGPS service has been available from 19<br />
DGPS stations located on the East and West coasts of Canada and parts of the Great Lakes. DGPS corrections are<br />
broadcast from medium frequency (MF) radiobeacon transmitters located to cover selected marine areas and waterways.<br />
The broadcasts are in accordance with international standards for radiobeacon DGPS services. DGPS provides continuous<br />
precise positioning of better than 10 metres for 95% or better of the time (provided that suitable DGPS receiver equipment<br />
is utilized, properly installed and maintained).<br />
Additional information on the use of the DGPS service will be announced through Notices to Mariners. General<br />
information is also available from the CCG Website: http://www.ccg-gcc.gc.ca/dgps/main_e.htm.<br />
The corrections from the DGPS service are calculated at the reference station in the NAD 83 coordinates. To process the<br />
information properly, DGPS receivers should be adjusted to the WGS 84 setting. Although WGS 84 and NAD 83 are<br />
essentially the same (only a few centimetres difference), it is highly recommended that all DGPS receivers be set to WGS<br />
84 to take full advantage of the precision of DGPS. When utilizing charts other than NAD 83, DGPS latitude and<br />
longitude positions must be adjusted to the appropriate datum using the information contained in the charts.<br />
The table that follows provides information on existing DGPS broadcasts. A list of United States <strong>Coast</strong> <strong>Guard</strong> (USCG)<br />
DGPS transmitters providing coverage in <strong>Canadian</strong> waters may be obtained directly from the USCG.<br />
http://www.navcen.uscg.gov/dgps/default.htm.<br />
Figures 1, 2 & 3 show the nominal coverage from existing broadcast stations. Users should be aware that coverage is<br />
subject to short and long term variations due to environmental and seasonal conditions.<br />
Station Name<br />
Location<br />
NAD 83<br />
CCG DGPS BROADCASTS<br />
Pacific <strong>Coast</strong><br />
Frequency and<br />
Transmission<br />
Rate<br />
IALA<br />
Reference<br />
Station ID<br />
IALA<br />
Radiobeacon<br />
ID<br />
Remarks<br />
Alert Bay, BC 50º35’N 126º55’W 309 kHz 200 bps 300, 301 909 Full Operational Service<br />
Amphitrite Point, BC 48º55’N 125º33’W 315 kHz 200 bps 302, 303 908 Full Operational Service<br />
Richmond, BC 49º06’N 123º11’W 320 kHz 200 bps 304, 305 907 Full Operational Service<br />
Sandspit, BC 53º14’N 131º49’W 300 kHz 200 bps 306, 307 906 Full Operational Service<br />
4-29
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