This addon simply changes the Boralus map to the Tiragarde Sound map. You may still view the Boralus map by clicking on it manually, but with this addon when you open your map within the borders of Boralus it should default to the Tirigarde Sound map.
Adapted from the work of scainburger who made "No Thunder Totem Map" back in legion, who no longer maintains it and gave permission for me to upload this adaptation.