South and North Korea have resumed radio communication at sea for the first time in over a decade.
The system was tested on Sunday at around 9 a.m. Korea time.
The defense ministry in Seoul says a South Korean patrol boat contacted a North Korean boat which responded immediately.
Maritime radio communications were shut down in May, 2008.
The decision to reopen them was based on the Panmunjom Declaration by the leaders of the two Koreas when they met in late April,and on the recent talks between the two sides’ militaries.