HIGH HORIZONTAL DILUTION OF PRECISION (HDOP) ADVISORY 25 March 2010 Users in certain parts of the world may experience short periods of high HDOP/PDOP centered approximately 60 miles East of Cape Howe, Australia from 251448Z - 251449Z Mar 2010 (one minute), a large area surrounding a point 240 NM Northeast of San Francisco from 252242Z - 252049Z Mar 10 (seven minutes), and a large area extending to the North of Montreal, Canada for 252213Z - 252216Z Mar 2010 (three minutes) due to satellite maintenance (NANU 2010048) Predictions are based on a "Best Four" analysis to illustrate the worst case scenario and are provided for situational awareness only

Please report any outages through the NAVCEN "Report a GPS Problem" page at http://www navcen uscg gov/gps/gpsuserinput htm

Sincerely,

US Coast Guard Navigation Center NAVCEN MS 7310 7323 Telegraph Road Alexandria, VA 20598 - 7310 Tel: 703-313-5900 Website: www navcen uscg gov

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