ZCZC IA77 021059 UTC JUL BALTIC SEA NAV WARN 026/25 SOUTHERN SOUTHEASTERN CENTRAL AND NORTHERN BALTIC GULF OF FINLAND GULF OF RIGA AND SEA OF AALAND. GNSSEN AIS RADAR AND DGPS INTERFERENCE OBSERVED IN AREA. MARINERS ADVISED TO EXERCISE CAUTION AND BE PREPARED FOR NAVIGATION IMPACTS. CANCEL BALTIC SEA NAV WARN 023/25 NNNN