Instructions
Place a posting online or in paper job boards. Use the relevant job boards for ships and other vessels in order to weed out unqualified candidates.
Create your requirements for the position. You should highlight D.O.T. certification from an accredited institution as one of the primary requirements. Be sure to use "mandatory" language rather than "recommended." This will weed out candidates.
Verify the certification. Take a look at the candidate's certification. Make sure it comes from an accredited institution. If you have any doubt, call the institution in question and verify the candidate's successful completion.