penfold
Well-known member
As bedouin said, it does exactly that for purposes of colregs. A vessel constrained by her draft (VCD) can not claim the special treatment afforded by the rules if the shape/lights are not shown. Note that a VCD is not obliged to show the relevant signal (see rule 28 "may"), whereas a NUC vessel and a RAM vessel (for example) must show the relevant signal (rule 27 (a) and (b) "shall").
Point well made; it doesn't help with rule 9b though, which makes no stipulation about any signals.