Typical Austronesian ship designs, left to right:
*Hōkūlea, a replica Polynesian voyaging catamaran with crab claw sails
*Filipino double-outrigger paraw with a crab claw sail
*A Melanesian single-outrigger tepukei with a forward-mounted crab claw sail from the Solomon Islands
*Nur al Marege, an Indonesian replica of a padewakang with tanja sails
*Waka, narrow Māori war canoes propelled by paddling (en)
the alternative routes in the cited source are overland versus by sea (en)
"safer coastal trade" is not mentioned in this reference, which is giving such a high level summary of events that it is arguably a reference in passing (en)
this paper makes no mention of Austronesians whatsoever. Incidentally, the early direct evidence of humans has been questioned for accuracy. (en)
this paper covers a variety of hull shapes, but does not mention the sails named in this paragraph and discusses different dates than those given here (en)
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