Navisense is maritime data processing company specialized in the smart usage of high frequent AIS data streams. Our key mission to support harbour towage, ferry boat and other workboat companies with a simple tool to monitor and improve their operations, reduce their fuel consumption and lower emissions. With this in mind we developed a 'port-event logging algorithm' that identifies vessel behaviours and logs timestamps of maritime operations. Based on those timestamps our software then automatically analyses performance and identifies fuel saving potentials. It does this completely sensor free with basically no data input from the client side. This makes it very easy to implement in any port worldwide.