Section 2(1)(c) in The Merchant Shipping (Recruitment and Placement of Seafarers) Rules, 2016
(c)"collective bargaining agreement" means,-(i)an agreement signed, from time to time, between the seafarers' trade unions and the Indian ship owners for employment of seafarers on board Indian flag ships; or(ii)an agreement signed between the concerned trade unions and employers for an employment on board foreign flag ships, which is in conformity with the laws of the flag State concerned;