Commercial Vessel Compliance

4/15/2015: High horizontal dilution of precision advisory

Users of the Global Positioning System in Spain and in part of the Southern Indian Ocean may experience short periods of high horizontal dilution of precision, or HDOP, and positional dilution of precision, or PDOP, where HDOP will be greater than a factor of 6 (HDOP >6) at various times from 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 on the Coast Guard Navigation Center’s website.

Please report any outages through the NAVCEN “Report a GPS Problem” page.

This blog is not a replacement or substitute for the formal posting of regulations and updates or existing processes for receiving formal feedback of the same. Links provided on this blog will direct the reader to official source documents, such as the Federal Register, Homeport and the Code of Federal Regulations. These documents remain the official source for regulatory information published by the Coast Guard.