The training team at EUMETSAT is offering a series of online short courses that are open to all interested participants. On 25 November 2020, Lauren Biermann and Oliver Clements will be offering a course on The Colour of the Oceans, dealing with data from the Ocean and Land Colour Instruments (OLCI) onboard the Sentinel-3 satellites, including data access, visualization and processing. Tools will include Python, Jupyter Notebooks and SNAP. More information about the online series and the course schedule is available at https://training.eumetsat.int/course/index.php?categoryid=97, where participants can also register for the courses. Each short course will offer a webinar with a presentation, a demonstration of data discovery and data application. Some courses will also include a follow-up self-paced phase where participants will have the opportunity to further explore the data and discuss it with experts.