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Yep I hear what you say. In some regards its a pity we don't have global rules for scuba, rather than a country mishmash for each country. However the down side is bureaucratic domination, which is the bigger evil? It would be nice to have one set of standards and rules no matter where you go.
Mine is a 6' SMB and if I fill it tight its impossible to get it to stand up easily. If I do a 90% fill then its so much easier. . 90% of 6' os ummmmmm about 5'6" of above surface SMB. if its 100% full and more like 45 degree angle most of the time that's about ummmmmmm 4 foot out of the water. As the girls would say, 5'6" seems more adequate than 4' (or so the saying goes???)
As topside support I certainly won't react any differently to a single SMB regardless of color. Two on the same line means trouble. Ultimately, it's up to the dive team to inform the crew what they intend to signal us with and we do as instructed. When it's my team on the bottom one bag means "surfacing on the line" two bags means trouble (and to get in the chase boat to check the wetnote we sent up on the second bag for instructions).
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