15 days northward :

Antigua and Barbuda dating from the seventeenth century, St John, the capital of this state is one of the oldest trading ports in the Caribbean. Barbuda, whose coastline is almost devoid of any building is a flat island surrounded by white sand beaches. Lovers of corals will find something to marvel. 

Martinique / Antigua: 153 miles, approximately 25 hours of navigation

Saint Martin and Saint Barthelemy: Two french Overseas communities welcome you to the northern archipelago of the Lesser Antilles. Come look Saint Martin and Sint Maarten French space, the Dutch side of the island. In St. Barts, or "Little St. Tropez of the Caribbean", you can rub shoulders with your favorite stars. 
Martinique / Saint Barthelemy: 239 miles, approximately 40 hours of navigation .

Exemple de route vers les iles du nord depuis la Martinique