Whilst drooling over some imagery of a Vagabond 47 (dreaming is free, etc.), I noted these triangular sail-like contraptions on the attached line drawing, that I highlighted in yellow.
As far as I know, these cannot be storm
sails, nor "mooring sails" (I mean the small sail ketches put up while on
mooring to stop
boat movement).
So - what are they?
Many thanks in advance.