There is a grandfathering regulations in Title 46 CFR 11.463 for towing vessel endorsements that could still benefit mariners. Mariners who met the training and service requirements for towing vessels before May 21, 2001, and have maintained a valid Coast Guard-issued credential may obtain a towing endorsement if they meet the following:
- Demonstrate at least 90 days of towing service before May 21, 2001.
- Provide evidence of successfully completing the apprentice mate exam.
- Meet the renewal requirements in 46 CFR 10.227.