Geerhard Janse is part of the team "Onboard Specialists". He goes onboard vessels around the globe to conduct measurements onboard ships. The goal is either to check contractual obligations (such as fuel consumption, manoeuvring characteristics, bollard pull performance), or to find the cause of a certain problem (such as excessive vibrations, propeller cavitation erosion, etc.). Also research is part of Geerhard's work. For example: what is the effect of an Energy Saving Device on fuel consumption? See https://www.youtube.com/watch?v=B7-Y8X2XNxc And, does air lubrication really work? The motto of MARIN's onboard specialists is: "Any Time, Any Sea".