ZCZC JA81 121000 UTC OCT BALTIC SEA NAV WARN 030/26 SOUTHERN SOUTHEASTERN CENTRAL AND NORTHERN BALTIC GULF OF FINLAND GULF OF RIGA AND SEA OF AALAND. GNSS AIS RADAR AND DGPS INTERFERENCE OBSERVED IN AREA. MARINERS ADVISED TO EXERCISE CAUTION AND BE PREPARED FOR NAVIGATION IMPACTS. CANCEL BALTIC SEA NAV WARN 026/25 NNNN