SECURITE 041500 UTC DEC 2023 NAVAREA IX 453/23 RED SEA SAUDI ARABIA CHARTS BA 158, 326, 327, 328 ISOLATED DANGER BUOY A3-1 GP FL(2)10SEC WITH TOPMARK 2 BLACK SPHERES ESTABLISHED IN POSITION 23-57.95N 038-09.63E (.) MARINERS CAUTIONED