42. For the purpose of regulation 41 of these Regulations, a person shall be qualified in the operational use of automatic radar plotting aids if he holds:
(a)a valid Electronic Navigation Systems Certificate granted by the Secretary of State, or
(b)a valid Navigation Control Certificate granted by the Secretary of State, or
(c)a valid Automatic Radar Plotting Aids Certificate granted by the Secretary of State, or
(d)a certificate recognised by the Secretary of State as being equivalent to any of the certificates mentioned in (a), (b) or (c).