The standard that NauticEd offers is the American National Standard for Sailing Training and Assessment as approved by the American National Standards Institute and created and approved by the United States Coast Guard.
See this proof of verification and accreditation: https://www.nauticed.org/images/certification/NASBLA/Verified-Course-Approval.pdf
NASBLA is the organization approved by every state and territory in the USA to oversee boating licensing.
See the International Proclamation by NASBLA
See this Official Statement by NauticEd regarding the SLC License
This is the United States Coast Guard approval seal issued to NauticEd
