"come about", nautical -- "of the wind", and Obs., in OED?

[Joel S. Berson]

The OED2's nautical definition of "to come about" (come, v., PV1, 2)
is "Of the wind: To turn, esp. into a more favourable quarter; to
veer round. Obs."  But --

1)  Does the wind turn, or the sailing ship?

2)  Hardly seems obsolete (except perhaps to refer to the *wind* turning!).

Joel

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