Hi.
Helm, steering position of any vessel, often done by a quartermaster/AB, under instruction from a Master, Pilot etc.
Cox, short for coxswain. Usually in charge of a service vessel, ie lifeboat, Police launch, Pilot boat, defence agencies and groups.
Skipper. Master of a vessel, generally though not restricted to smallish vessels with near coastal capabilities, though in reality and master can be reffered to as Skipper!!
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