Master of Towing Vessels- Limited. This is a mid-level merchant mariner credential. The general requirements for this credential are TWIC Card (Identification, Fingerprints, Citizenship, Social Security number, etc), CG-719B Application, NDR Consent & Check, Oath, 3 letters of recommendation, photograph (supplied by TSA), SSEB Screening complete, age of 21 or over, CG-719K Physical Exam, Medical Tab in MMLD, Drug Testing Compliance, Mariner Fees, Sea Service Letters or Discharges, and recency- 90 days in the past 3 years on vessels. Service requirements include if SNM holds an endorsement as Mate (Pilot) of Towing Vessels; s/he may have: Master of Towing Vessels (Limited), added to their MMC, for a limited local area, designated by the local OCMI, within the scope of their current route; or 1080 days of service, including 540 days on Tow Vessels as a Limited Apprentice Mate (Steersman), of which 90 days must have been on the particular limited local area, designated by the local OCMI, within the scope of their current route, and completion of a TOAR. There is no examination for this credential.