Re: Which is stand-on vessel?
Few yachts carry enough shapes for the correct day shapes that could have been shown.
On seeing a tow, I'd watch like a hawk & avoid if I thought they were not avoiding me. Point is that you have no idea why the yacht is being towed. Could be the motor just died. Or, the rudder could be jammed hard over. There may be an unseen drogue stabilising the whole lot.
But driving the tow, I'd also try to keep clear of yachts if I could.
Sounds by the "be a sport" comment the tow could have kept clear.
I always wanted to learn to spell "engineer". Now I are wun.