Received a short message with unknown signal at sea.

A longitude 12 1 degree is east longitude, the northeast hemisphere is 20 degrees west longitude, the east longitude 160 degrees, and the eastern hemisphere is 12 1 degree. After all, the radio communication range of general ships is limited, and the signal received by our country should be in the coastal annex of our country and can only be determined as A.

But strictly speaking, this question is not rigorous. Just now, I searched these four areas on Google and found that A is on land (of course, it can also be considered that the navigation system of the ship is partially deviated).

12 1 E, 30 N is on land (Shangyu city near Ningbo).

121w and 30 N are located in the western Pacific of the United States.

12 1 E, 30 S is located in the Australian mainland.

12 1 30 west longitude is located in the south Pacific.

China is the northern hemisphere, at 30 degrees north latitude. It can't be south latitude. Longitude 12 1 degree is east longitude, because the northeast hemisphere is 20 degrees west longitude, and east longitude 160 degrees, 12 1 degree is just in the eastern hemisphere.