Below is info that I've received from Shauna Shuttle Services
Hi Joyce,
Thank you for your e-mail. The boat leaves from 2 different docks in St. Maarten. One directly from the airport, and the other from Simpson Bay. There are 2 covered passenger power boats;
One accommodates 22 passengers maximum, and the other 12 passengers. We operate daily to and from St. Maarten airport,
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The Friendly St.Martin Island Forum