2019 AUV Sentry vehicle-corrected navigation and raw magnetic sensor data, Marion Rise – South West Indian Ridge

This data set consists of raw magnetic field measurements and vehicle-corrected navigation for autonomous underwater vehicle (AUV) Sentry dives over Marion Rise portion of the South West Indian Ridge collected in 2019 during research cruise TN365 on R/V Thomas Thompson. AUV Sentry is operated as part of National Deep Submergence Facility (NDSF) by Woods Hole Oceanographic Institution (WHOI) and is funded by the National Science Foundation (NSF). The AUV Sentry magnetometer is an APS (Applied Physics Systems) model 1540 3-axis fluxgate sensor(https://www.appliedphysics.com/products/magnetometers/). AUV Sentry has three magnetometer sensors, two are located mid-body on the port and starboard side and one is located in the top of the vehicle. This data file contains raw magnetic field data from the 'top' sensor which is also identified as the '02' sensor. Navigation is by ultra-short base-line (USBL). The data files are in ASCII format with the following columns: year, month, day, hour, min, sec, longitude(dec. degrees), latitude (dec. degrees), depth (meters), pressure (decibars), heading (degrees), pitch (degrees), roll (degrees), altitude (meters), mag02x (nT), mag02y (nT), mag02z (nT), optical backscatter sensor OBS (volts), redox potential eh (volts), rate of change of redox potential dehdt (volts/second), oxygen O2 (micromolar), temperature (celsius), conductivity (siemens/meter), sound speed (meters/second), sound velocity profile SVP (meters/second). The data set was collected under grant OCE-1657983 from the US National Science Foundation with additional support for ship time and Sentry deployment provided through the State Key Laboratory of Tongji University, Shanghai, China.