The GPS navigation signal may be unreliable until 27 mar due to interference testing on GPS frequencies used…

Original warning text

1. THE GPS NAVIGATION SIGNAL MAY BE UNRELIABLE
   UNTIL 27 MAR DUE TO INTERFERENCE TESTING ON
   GPS FREQUENCIES USED IN SHIPBOARD NAVIGATION
   AND HANDHELD SYSTEMS. GPS SYSTEMS THAT RELY
   ON GPS, SUCH AS E-911, AIS AND DSC, MAY BE
   AFFECTED WITHIN 317 MILES OF 36-00-56.3N
   117-36-27.8W. DURING THIS PERIOD GPS USERS ARE
   ENCOURAGED TO REPORT ANY GPS SERVICE OUTAGES
   THAT THEY MAY EXPERIENCE DURING THIS TESTING VIA
   THE NAVIGATION INFORMATION SERVICE (NIS) BY CALLING
   703 313 5900 OR BY USING THE NAVCEN'S WEB SITE'S
   GPS REPORT A PROBLEM WORKSHEET AT WWW.NAVCEN.USCG.GOV.
2. CANCEL THIS MSG 28 MAR.