In nautical terms the difference between helmsman and wheelsman
is that helmsman is a member of a ship's crew who is responsible for steering while wheelsman is helmsman.
helmsman
English
Noun
(
wikipedia helmsman)
(
helmsmen)
(nautical) A member of a ship's crew who is responsible for steering.
(figuratively) A leader.
wheelsman
English
Noun
(wheelsmen)
(nautical) helmsman