Michael am I missing something here? Are you spending a year in South Africa/Mauritius? If you are arriving in Cape Town in March (I think you said at the earliest) and spending a couple of months in South Africa, say April-May, you would be heading onward in the fall into winter, June/Julyish? It is early in the morning here and I may not have read your itinerary properly.
In South Africa doing lots of boat stuff. Departure north from Cape Town around December 15th. Arrival in the Caribbean around the beginning of February, after 5300 miles or so.