 In contrast, more distant outlying descendant populations in Micronesia and Polynesia retained the double-hull and the single outrigger canoe types, but the technology for double outriggers never reached them (although it exists in western Melanesia).To deal with the problem of the instability of the boat when the outrigger faces leeward when tacking, they instead developed the shunting technique in sailing, in conjunction with reversible single-outriggers.The simplest form of all ancestral Austronesian boats had five parts.