Issued by
USCG Captain's License
USCG (federal)
State Boating License
State agency (varies)
Captain's License vs Boating License — What's the Difference?
These get conflated in search but they are entirely different credentials issued by different governments for different purposes.
TL;DR
Captain's license = federal USCG OUPV / Master, required to carry paying passengers. Boating license = state safety certificate, required to operate a recreational boat in many states. The federal credential does not replace the state requirement, and vice versa.
Purpose
USCG Captain's License
Carry paying passengers commercially
State Boating License
Recreational boat operation
Required for charter?
USCG Captain's License
Yes — federal mandate
State Boating License
Maybe — depends on state
Sea-time required
USCG Captain's License
360+ days documented
State Boating License
None typically
Exam difficulty
USCG Captain's License
Multi-module written, 70%+ pass mark
State Boating License
Online proctored, ~30 min
Renewal
USCG Captain's License
Every 5 years, with physical and TWIC
State Boating License
Lifetime in most states
Bottom line
If you carry paying passengers, you need the USCG captain's license — the boating license alone is not enough. Many charter operators hold both: the federal USCG OUPV plus the state's commercial-fishing-guide license.