The National Transportation Safety Board’s Findings on the Loss of the Cargo Vessel Bonnie G

The National Transportation Safety Board (NTSB) has released its report on the grounding and total loss of the cargo vessel Bonnie G in St. Thomas, U.S. Virgin Islands. The incident, which occurred on October 4, 2023, was attributed to inadequate anchor chain scope and navigational errors.

According to the NTSB investigation, the vessel was anchored approximately one mile south of St. Thomas when the anchor chain parted, causing the vessel to drift and eventually ground. All 12 crew members were safely evacuated by the U.S. Coast Guard, with no injuries or pollution reported. However, the vessel, valued at $1.5 million, was declared a total constructive loss.

Key Findings and Errors

The investigation revealed that the captain had misjudged the weather conditions upon arrival at Crown Bay, where the vessel encountered stronger winds than anticipated. A loaded barge blocking the intended docking location forced the decision to anchor.

A critical error was identified in the anchoring operation, where only 135 feet of anchor chain were deployed based on an incorrect water depth assessment. The actual depth was 68 feet, requiring 2.5-3.5 times more chain for secure anchoring, as per NTSB guidelines.

Further errors occurred when the captain failed to consult navigational charts after the anchor chain parted, leading the vessel onto a nearby rock. This resulted in a hull breach and progressive flooding due to an open watertight door in the engine room.

NTSB Recommendations

The NTSB emphasized the importance of using appropriate anchor chain lengths based on water depth and weather conditions. They also stressed the need for mariners to review navigational charts and local information to identify hazards, especially in adverse weather.

Overall, the NTSB concluded that the grounding of the Bonnie G was a result of both inadequate anchor chain scope and navigational errors. Their report serves as a reminder of the critical importance of proper anchoring procedures and thorough navigation planning to ensure the safety of vessels and crew.