Own internal ratings.
Many shipowners have their own internal rating systems in some shape or the other. These internal systems can span from very complex custom built systems to "a little black book". Common for all of these is that they will only show the shipowners'/operators' own ratings, whereas BunkerTrust will collate and validate all ratings. In most cases the internal ratings can be passed to BunkerTrust either as data dumps, through API or simply by passing an email. All the data will then be combined with existing data to get the critical mass.