The following information obtained from UNAVCO's online DOI system: (https://www.unavco.org/data/doi/search/search.html) GULFNET GPS Network - GRIS-Grand Isle P.S. Start: 03-Sep-2005 End: 02-Jun-2019 Dokka, Roy K., 2005, GULFNET GPS Network - GRIS-Grand Isle P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/T5736NZQ