It isn't actually just a visibility thing....... although close in that's definitely an issue with different craft running different lines.
Parawingers tacking back upwind a long way out need to keep an eye out for other downwinders also. On a couple of occasions now I've had to take avoiding action on a dw sup run due to a parawinger with the trash bag deployed totally oblivious to me hacking downwind a km offshore.
Generally I'll give a shout out to make them aware I'm there but on these occasions they either had music on or were grumpy as and didn't want to acknowledge (my voice carries trust me)
