Moorings has a base at Marigot Bay, St. Lucia, and a subbase at Canoaun (mid-way between St. Lucia and Grenada). I recently returned from a 12-day one-way charter with Moorings from St. Lucia to Grenada. Great trip! I also understand the the St. Vincent Sunsail base at Blue Lagoon is shutting down this summer. Sunsail & Moorings are owned/operated by the same parent company.
