Section 7(1)(c) in The Merchant Shipping (Examination of Engine Drivers of Sea-Going Ships) Rules, 1973
(c)on regular watch in the machinery spaces on foreign-going or home trade ships as an engineer, engine driver, fitter, serange, tindal, donkey man, winch man, donkey greaser, greaser or oilman, pump man, engine room rating or in any other similar capacity.