This dataset contains buoy data for the Indian and Southern ocean during the pasage of very long swells from storm "Rosemary". Spotter buoy data is described in Raghukumar et al. (2019), and heave spectra from the Southern Ocean Flux Station is described in Hay et al. (2023). This buoy dataset is used in the following paper: "Phase-resolved swells across ocean basins in SWOT altimetry data: revealing centimeter-scale wave heights including coastal reflection" in combination with SWOT data and numerical wave model results.