Some times ago was a discussion about gear shift while sailing. Most Amel have a sticker beside the gear level saying never have the shift to forward while sailing and engine off.
My understanding is there is no difference for the prop if turned by sailing or by current. So if you don't want a turning prop while at anchor shift to reverse or whatever your sticker say.
I do have a Hurth gearbox with the sticker saying NO forward while sailing and engine off.
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Gerhard Mueller
Amel Sharki #60
Currently Kalamata, Greece