This dataset contains the Underway (UWY) data collected on Linnaeus voyage LI2015_V15. The voyage took place on 29 May 2015 from Hillarys Boat Harbour to Ningaloo Reef and back to Hillarys (WA) on 12 June 2015. Voyage Title: Geological mapping and towed camera survey - Ningaloo Reef. The purpose of this voyage was to undertake geological mapping and towed camera survey at Ningaloo Reef. There were no CTD deployments during the voyage. Fluorometer sensor data were not collected for part of this voyage due to sensor fouling from the previous voyage. The Underway (=continuously recorded) dataset from this research voyage includes Navigation (NAV), Sounder and Thermosalinograph (Seabird TSG 45) data. NAV data includes GPS (Global Positioning System) measurements of latitude, longitude, ship's direction and speed. Data are stored at 1 second intervals (NetCDF format) and both 10 second 5 minute intervals (.csv format), including a 10 second PDR (Precision depth recorder) file in .csv format. All data timestamps are in UTC. Additional information regarding this dataset is contained in the data processing report for this voyage.