We have investigated an alternative assignment of manning on board Dutch coasters to show that the current level of safety is maintained when mono disciplinary Chief Engineers are replaced by Marof: Maritime Officers, who have received education in navigational as well as engineering skills (at watch keeping level). We compared the alternative crew concept to the traditional assignment in a study involving 19 modern shortsea ships. Measurements were gathered on 311 voyages, in over 16,000 shifts and in almost 60,000 hours. The crews had to answer on a PDA questions about the specific conditions, the navigational and engineering task, and the safety outcome. The results indicate that sailing with a Marof in combination with shore support is at least as safe as sailing with a Chief Engineer. Further, the shifts went more satisfactory and the crews were less tired compared to traditional shortsea ships, which contributes to the avoidance of fatigue.