High Horizontal Dilution Of Precision (HDOP) Advisory 15 April 2015

Users of the Global Positioning System (GPS) in Spain and in part of the Southern Indian Ocean may experience short periods of high HDOP/PDOP (HDOP >6) at various times between 151530Z – 160330Z APR 2015 due to satellite maintenance (NANU 2015-024). Predictions are based on a "Best Four" analysis to illustrate the worst case scenario and are provided for situational awareness only. You may view illustrations of the events at the following NAVCEN page: http://www.navcen.uscg.gov/?pageName=HDOP_Event_04152015

Please report any outages through the NAVCEN "Report a GPS Problem" page: http://www.navcen.uscg.gov/?pageName=gpsUserInput