TVIB News Subchapter M Updates

TVIB FAQ – Signage requirements for a CO2 fixed fire-extinguishing system

What are the signage requirements for a CO2 fixed fire-extinguishing system?

In this FAQ, TVIB provides the signage requirements for CO2 fixed fire-extinguishing systems.

This FAQ also centralizes the applicable citations and requirements that are not directly found within Subchapter M.

Take a few minutes to review the full FAQ to ensure your vessels meet all compliance expectations. 

Find Detailed Guidance in Our FAQ
For comprehensive answers and guidance visit the FAQ section on our website: TVIB FAQ. Use the search function with the term “signage” or navigate to 46 CFR Part 142 for relevant details. 

USCG: REVISIONS to NVIC 01-89 Change 1 Underwater Survey Guidance – UWILD Considerations

Review of the Updated UWILD Policy

The updated UWILD policy has no direct impact on the brown water fleet. It emphasizes the importance of visibility during underwater surveys conducted by divers or remotely operated vehicles (ROVs).

Brown water operations—typically conducted in inland and coastal waterways such as rivers, canals, and bays—often involve confined waters and limited visibility. These conditions make it difficult to meet the policy’s visibility requirements, which state:

  • Water clarity must be sufficient for the diver or ROV to view the full height of the propeller and rudder in a single frame.

If this level of clarity cannot be achieved, operators must consider alternatives such as relocating the vessel, waiting for improved conditions, or drydocking.

Other key updates:

  • Expanded Eligibility:Vessels over 15 years old may qualify for UWILD with certain conditions and CG-CVC endorsement.
  • Third-Party Oversight:Unclassed ITVs operating under a TSMS can use their TPO to verify UWILDs without mandatory Coast Guard presence. Simplified documentation applies, and both the TPO and OCMI must be notified.
  • Harmonization:DD/ISE dates may now align with Load Line (LL) inspections for unclassed vessels.
  • Technology Use:ROVs equipped with advanced cameras and lighting may improve visibility in marginal conditions.

All other UWILD policy requirements remain unchanged.

TVIB FAQ – General Alarm Requirements – Subchapter M

Where should audible and visual general alarm devices be positioned onboard Subchapter M towing vessels? 

We’ve published a new FAQ that explores the general alarm requirements under 46 CFR 143.235 and offers clear guidance on proper placement of alarms and supplemental flashing red lights. This resource includes helpful regulatory text and practical considerations for auditors, surveyors, and vessel operators. 

Take a few minutes to review the full FAQ to ensure your vessels meet all compliance expectations. 

Find Detailed Guidance in Our FAQ
For comprehensive answers and guidance visit the FAQ section on our website: TVIB FAQ. Use the search function with the term “general alarm” or navigate to 46 CFR Part 143 for relevant details.