Found in the April USCG Local Notice to Mariners
Reported by member Mike Epprecht
GPS May be Unreliable in Large Area of Chesapeake Bay, April-Oct:. The following announcement is from the USCG 5 th District LNM 15/08.
The GPS Coordinates given below are for the Patuxent Naval Air Station, located on the southern bank of the Patuxent River on the Chesapeake Bay in southern Maryland:
"THE GPS NAVIGATION SIGNAL MAY BE UNRELIABLE FROM 01 APR 08 - 31 OCT
08 DUE TO INTERFERENCE TESTING ON GPS FREQUENCIES USED IN SHIPBOARD
NAVIGATION AND HANDHELD SYSTEMS. SYSTEMS THAT RELY ON GPS, SUCH AS
E-911, AIS AND DSC, MAY BE AFFECTED WITHIN A 35 NM RADIUS OF POSITION
38-15-41N, 076-26-01W 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"
U.S. COAST GUARD AUXILIARY ANNOUNCES BOATING COURSES
Seamanship: Navigation, Knots, Weather & Radios, June 28th.
Call Peter Murray at 410-745-9794 for details.