The International Oceanographic Data and Information Exchange (IODE) project office of the Intergovernmental Oceanographic Commission (IOC) held the IODE/OBIS-Event-Data workshop on animal tagging and tracking (ATT) from 23 to 26 April 2018 in Ostend, Belgium, to test the OBIS-ENV-DATA standard through the development of data products for scientific applications. This workshop was attended by 22 participants from 8 countries representing the major animal telemetry networks in Africa, Antarctica, Australia, Canada, Europe and the USA. The participants agreed to use the OBIS-ENV-DATA Darwin Core standard to exchange and publish detection data through OBIS (both acoustic and satellite) and work with OBIS and the scientific community to develop data products for the Essential Ocean Variables (EOV) of the Global Ocean Observing System (GOOS), in particular the “Marine turtles, birds, mammals abundance and distribution EOV” and the “Fish abundance and distribution EOV”. The guidelines for the implementation of the OBIS-ENV-DATA standard for tracking data (acoustic and satellite detections) were agreed upon and will be further refined and documented in collaboration with the data standardization working group of the International Bio-logging Society as well as the Biodiversity Information Standards (TDWG) community which oversees development of Darwin Core. In collaboration with several scientists involved in animal tracking, the OBIS Secretariat is developing a data aggregation tool (which will be available as an R package) to calculate home ranges, migration pathways and movement patterns based on the tracking data in OBIS. It is expected that new public tracking data will be made available to OBIS before mid-2018 and the first products be available early 2019. It was felt important that OBIS provides access to the relevant (aggregated) data used to calculate the scientific products and provide links back to the original (raw) data sources to ensure proper data provenance and allow reproducibility. This was the first ...