USCG Policy Letter 01-02 Section 11 (d): An applicant who holds either a 500 GRT or at 1,600 GRT license and STCW certification that were based on service that began [U]on or after 1 August 1998[/U] and wishes to apply for a third mate’s license must acquire the sea service required by 46 CRF 10.402 and 10.407. [U]No further testing or assessments are required. [/U]