Australian wilderness and coral reef diving itineraries aboard the yacht True North, which features an on-board helicopter.

Large ship sailings around Australia and in the South Pacific, departing from Sydney and Brisbane.

Small cruise line with small-ship expedition cruises in Australia's Great Barrier Reef, New Zealand and small South Pacific islands.

Small, high-end line with ships that carry up to 110 guests. Relatively exotic destinations and access to small ports. Offers charters

Very high-end Scottish luxury line operating small ships around Northern Europe, the Med, the Caribbean and South America. Pricing is more inclusive than most.

Small yacht sailings in the Greek Islands and the Red Sea.

Indian Ocean and African river cruises on smaller ships. Includes fleet, itinerary and charter flight information.

Large, "Italian style" contemporary cruise line with sailings in the Mediterranean and Caribbean. Offers online booking.

French line with modern sailing vessels on exotic itineraries around the world.

Small line with sailings to Alaska, Pacific Northwest and Mexico on small yachts (12-36 guests each). Itineraries feature close-up viewing of wildlife.