The OSV credentials without the tonnage limit of 6000 ITC were erroneous. The reasoning was that since the largest OSV cannot (currently) exceed 6000 ITC, not putting any tonnage would have the effect of letting the mariner wortk on any current OSV. However, current regulations limit the OSV license to 3000 ITC, so the actual effect of not adding the tnnage limit was to decrease the authority to 3000 ITC. Good intention, bad result. When the consequences were made apparent, they resumed use of the 6000 ITC limtation.