Sentence:  In the neighborhood of each defensive sea area the following entrances are designated for incoming and <WSD>outgoing</WSD> vessels: "Atlantic". ... Designated entrance for <WSD>outgoing</WSD> vessels: The main entrance to the Panama Canal, between the breakwaters. "Pacific". ... Designated entrance for outgoing vessels: Canal prism. 
Meaning of the word marked with <WSD> tags:  Going out, on its way out.