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Ships sailing from Fujian to Southeast Asia could choose between two different sea routes. The first route followed the China coast to central Guangdong; it then led to Hainan, the Champa coast and Pulau Condore, an island near the southern tip of Vietnam. From there it continued in three directions: to Siam, to northwestern Borneo and to the Malayan east coast. Going south to the Malayan east coast was the most direct way to Trengganu, Pahang, Pulau Tioman, Johore and modern Singapore whence it was possible to sail into the Indian Ocean or to cross over to Sumatra, Bangka Island and Java.
Roderich Ptak (Tue,) studied this question.
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