ZCZC HA57 251715 UTC SEP 26 IRAKLEIO RADIO NAVWARN 1217/26 CENTRAL AEGEAN SEA. CONDUCT OF SYSTEMS TRIALS FROM 280700 UTC UNTIL 291700 UTC SEP 26 IN AREA BOUNDED BY: 37-09.00N 023-20.00E 37-09.00N 025-17.00E 38-04.00N 023-20.00E 38-04.00N 025-17.00E AVOID CROSSING ABOVE AREAS. CANCEL THIS MSG ON 291800 UTC SEP 26 NNNN