Drifting buoys were built and designed at Institut des sciences de la mer de Rimouski (ISMER). They consist of a 4 cm-thick plate of 25-40 cm in diameter made of pine wood studs fixed together with aluminium bars. A GPS tracking device (Spot TraceTM) is fixed to the plate and sends its location every 10 minutes. A weight of 1 kg is attached to the plate with a nylon wire and hangs 20 cm below the plate to avoid capsizing in wavy conditions. Deployments were conducted in the southeastern portion of the Gulf of St. Lawrence in June-July and October-November 2014, in Baie des Chaleurs in June-July 2015, and in the Lower St. Lawrence Estuary in August-September 2014 and 2015. The dataset was quality controlled to remove data points on land, those during which the buoy is immobile (beached), and those experiencing speed variations greater than 0.1 m/s over a 10-minute interval (acceleration greater than 0.00016 m/s^2).

Supplement to: Tamtare, Tamkpanka; Dumont, Dany; Chavanne, Cédric (2019): Extrapolating Eulerian ocean currents for improving surface drift forecasts. Journal of Operational Oceanography, 1-15