DNV MED-B certification opens yacht market for Navis AP4000 autopilot. Helsinki-based Navis Engineering Oy has passed an important milestone in the yacht sector, after receiving MED-B type approval for its latest generation type AP4000 autopilot from classification society Det Norske Veritas (DNV). Issued for a five-year period, the MED-B certificate provides assurance that the product complies with all the relevant international standards imposed on marine equipment of this type. The approval covers equipment delivery to newbuildings or existing vessels for retrofit.