ZCZC JA26 251809 UTC MAR KALINGRAD NAV WARN 050/26 SOUTHEASTERN BALTIC SHIPS EXERCISES 312100 UTC MAR THRU 302100 UTC APR IN AREA TEMPORARILY DANGEROUS TO SHIPPING BR-42 55-20.00N 020-08.00E 55-20.00N 020-25.00E 55-07.60N 020-25.00E 55-07.60N 020-08.00E CANCEL MESSAGE 302200 UTC APR NNNN