U.S. COAST GUARD
MARINE SAFETY CENTER

U.S. Tonnage Publications

Tonnage Regulations (46 CFR Part 69)

• 2016 (Current) Tonnage Regulations
• 2014 Tonnage Regulations
• Tonnage Regulations - Final Rule
• Tonnage Regulations - Notice for Proposed Rulemaking (NPRM)

Marine Safety Center Technical Notes (MTNs)

• MTN 01-98 CH-13 - Tonnage Administrative Policy
• MTN 01-99 CH-10 - Tonnage Technical Policy
• MTN 04-03 CH-4 - Technical Support and Oversight of Authorized Classification Societies
• MTN 04-03 CH-3 Enclosure (1) - ACS Notification Worksheet

Navigation and Vessel Inspection Circulars (NVICs)

• NVIC 11-93 CH-3- Applicability of Tonnage Measurement Systems to U.S. Flag Vessels

IMO Tonnage Rules and Interpretations (TM Convention)

• TM Convention - Draft Text Version With Figures

Marine Safety Center Tonnage Guides

• Tonnage Guide 1 - Simplified Measurement
• Tonnage Guide 2 - Measurement of Navy and Coast Guard Vessels
• Tonnage Guide 3 - Tonnage Measurement Records
• Tonnage Guide 4 - Registered Dimensions Under Formal Systems
• Tonnage Guide 5 - Documentation and Tonnage of Smaller Commercial Vessels
• Tonnage Guide 5 - Appendix (8.5"x11" Brochure)  (11"x17" Brochure) 

Miscellaneous Tonnage Documents

• Formal Measurement Application
  
• Measurement Organization Informational Notes for 19September2025 (latest addition)
• CG Number Requests - How-to Video 

Historical Marine Safety Center Technical Notes (MTNs)

• MTN 01-99 CH-9
• MTN 01-99 CH-8
• MTN 01-99 CH-7
• MTN 01-99 CH-6
• MTN 01-99 CH-5
• MTN 01-99 CH-4
• MTN 01-99 CH-3
• MTN 01-99 CH-2
• MTN 01-99 CH-1
• MTN 01-99
• MTN 01-98 CH-12
• MTN 01-98 CH-11
• MTN 01-98 CH-10
• MTN 01-98 CH-9
• MTN 01-98 CH-8
• MTN 01-98 CH-7
• MTN 01-98 CH-6
• MTN 01-98 CH-5
• MTN 01-98 CH-4
• MTN 01-98 CH-3
• MTN 01-98 CH-2
• MTN 01-98 CH-1
• MTN 01-98 CH-0

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 Last Modified: 6/20/2017