I’m not sure I understand the opening of your reply, although I completely concur w/ the follow-on statements.
First it’s stated that it’s not convention anywhere …
… then the reply goes on to cite the two standardized conventions:
Indicating instruments point “into” the wind. (into the flow)
Wind Maps and other meteorological products‘ symbology points “downwind” (with the flow).
I guess the question is whether an Apple Watch’s display is (or should be) considered an “instrument” or a “mapping symbol.”
To my own personal way of thinking, it should display as an instrument.
That said, I can see why a developer might choose “mapping symbol” as it’s being developed for a “mass audience.”