48 Cruise Report, RV ATAIR, Cruise 067I033-1, Bremerhaven – Thybor?n – Aberdeen, 23 Jul – 15 Aug 2024 Deployments were made on behalf of the Center for Marine Sensors (ZfMarS), Institute for Chemistry and Biology of the Marine Environment (ICBM) at the Carl von Ossietzky Universität Oldenburg. ZfMarS designs and builds these drifters that are equipped with 12 conventional D-cell alkaline batteries powering a GPS tracking device of type SPOT Trace. The tracker transmits the surface position of the drifter at a temporal resolution of 5 min. Once deployed, the drifters follow the flow field at the sea surface. Details on the drifters and earlier results can be found in Meyerjürgens et al. (2019) and Deyle et al. (2024). Figure 7.11. Location of surface drifter deployments conducted during cruise 067I033-1. The drifters were provided in a disessambled state ahead of the cruise. Consequently, each drifter was reassembled before deployment. This involved connecting the GPS tracking device to its power supply, switching the tracking device on, sealing the drifter properly, and attaching buoyancy and fins to the main housing of the drifter. Afterwards, the drifter was ready for de- ployment, which happened typically at the end of a CTD station with the vessel starting to steam at low speed. Figure 7.11 shows drifter deployment location and corresponding trajec- tories. Table 7.4 summarises the individual deployment information for each drifter.