Master-at-arms and regulating petty officer

What is the difference between a master-at-arms and a regulating petty officer?

Not much in practical terms, although the brief answer does not define formal rank or service distinctions.

The brief answer says there is not much practical difference between a master-at-arms and a regulating petty officer. It treats the titles as closely overlapping naval functions rather than wholly separate occupations. It does not spell out formal differences in rank, authority, navy, or period, so it cannot serve as a detailed organizational chart. The exchange is best read as a terminology warning when comparing naval personnel systems.