There is no IMO definition.
However, IMO Circular STCW. 7/Circ. 18 (Electronic Chart Display and Information Systems (ECDIS) Training) states that, while there may be no requirement for masters and officers serving on vessels fitted with ECDIS to meet the 2010 Manila Amendments before 1 January 2017, it is encouraged that, prior to serving on such vessels, these seafarers should be provided with generic training, for example, IMO Model Course 1. 27.