ZCZC KA46 AVURNAV CHERBOURG 47/26 CASQUETS - ROCHES DOUVRES SCIENTIFIC INSTRUMENTS CHANGE 1. PRESENCE OF SCIENTIFIC EQUIPMENT FROM 272200 UTC APR 26 TO 182159 UTC MAY 26 HYDROGRAPHIC SURVEY BY SHIPS OF THE FRENCH NAVY. LINE JOINING 49-09.77N 002-51.15W, 49-12.18N 002-48.39W, 49-08.84N 002-42.02W, 48-59.73N 002-39.68W, 49-02.62N 002-47.46W, 49-06.98N 002-45.59W, 49-09.77N 002-51.15W. MARINERS ARE ASKED NOT TO INTERFERE WITH THIS WORK AND TO KEEP A DISTANCE OF AT LEAST 400 METERS FROM THESE VESSELS. NAVIGATE WITH CAUTION 2. CANCEL THIS MSG 182359 UTV MAY 26 NNNN