https://www.gtiyc.org/hardwater-sailing-safety 2021-07-29 https://www.gtiyc.org/all-you-need-to-know-about-hard-water-sailing 2020-03-09 https://www.gtiyc.org/gtiyc-org-all-about-hard-water-sailing 2020-02-05 https://www.gtiyc.org/hard-water-sailing-the-basics 2020-02-05 https://www.gtiyc.org/ 2019-03-22