Yer, good point.theory: Original poster works for USCG and wants justification for writing huge tickets to pleasure boats - "nobody is using their day shapes properly"
Poster has a bee in his/her bonnet re motor sailing.
4 of the 5 knowledge questions are regarding the shape exhibited when motor sailing.
Normally it’s pretty easy to work out if an approaching sailboat has the thumper running. It’s not as if there’s total carnage out there through not displaying the correct shapes on recreational vessels.
Good chance OP is a pedantic little fellow .