Police patrol boat navigating rough seas, typical high-speed workboat subject to MGN 436 WBV monitoring requirements Workboat Code Edition 3 is in force. Existing vessels move across at the next renewal, or by three years after 13 December 2023, whichever is later. The first big milestone date is 13 December 2026. MGN 436 is guidance. The legal duties sit in the Merchant Shipping vibration regulations. Workboat Code Edition 3 then makes WBV and repeated shock control a real-w