To:     ALL MARINERS
From:   Coast Guard Upper Miss
Date: 1/20/10
Subject: GPS TESTING AT ST CHARLES, MO
NAVNOTICE # 2038

25 JAN 2010 through 02 FEB 2010
1. THE GPS NAVIGATION SIGNAL MAY BE UNRELIABLE DUE TO GPS
TESTING ON GPS FREQUENCIES USED BY SHIPBOARD NAVIGATION AND
HANDHELD SYSTEMS. SYSTEMS THAT RELY ON GPS, SUCH AS E-911,
AIS AND DSC, MAY BE AFFECTED WITHIN A 53NM RADIUS OF POSITION
38-55-35N 090-25-22W COMMENCING ON 27 JAN 2010 - 02 FEB 2010 FROM
1230-2200Z (0630-1600CST). DURING THIS PERIOD GPS USERS ARE
ENCOURAGED TO REPORT ANY GPS SERVICE OUTAGES THAT THEY MAY
EXPERIENCE TO THE NAVIGATION INFORMATION SERVICE (NIS) BY CALLING
(703)313-5900

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