Is this Truly Roaming eSIM valid for ferry travel to Dominica, Martinique, or Saint Lucia?

This is a crucial detail for island-hopping professionals. This Truly Roaming eSIM covers Guadeloupe and Martinique, as both are French departments and part of the EU. However, it will not function in Dominica or Saint Lucia, which are independent nations outside the EU. For seamless connectivity across multiple non-EU Caribbean islands, you would need separate regional or country-specific eSIMs.