46 C.F.R. § 10.210 Eligibility for towing license.
Title 46 - Shipping
The figure that follows illustrates the conversion of a towing license issued before May 21, 2001. The conversion will take place at the first renewal or upgrade of the license after May 20, 2001. [USCG-1999–6224, 66 FR 20935, Apr. 26, 2001]
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart B—General Requirements for All Licenses and Certificates of Registry
§ 10.210 Eligibility for towing license.

