The Canadian Ocean Mapping Research and Education Network (COMREN) aims to develop research activities, achieve technology transfer to industry, and develop and run educational programs. The International School on Hydrographic Surveying (ISHS) is the first training program proposed by the network. It was designed to provide participants with a multi-disciplinary training experience in close interaction with high-level scientists, professionals, and stakeholders from the hydrospatial environment. The 2021 edition of the school took place from October 25 to 29 at Université Laval with a set-up compliant with the pandemic conditions. This note highlights the main facts and outcomes about this training.