Pier du Sud est capitaine de voilier, marin et instructeur de voile. Il rédige des textes sur la voile, la navigation et les voyages en mer.
Trade winds.

Preparing for An Ocean Crossing

I am preparing for an ocean crossing. We will be leaving La Rochelle, sail south the Canary Islands, which will be our springboard for the trade winds. We hope to finish our crossing in Antigua, but our final destination is Nassau. It is a bit late in the season, as...

Celestial navigation

What is the sine of one degree?

Prior to the invention of computers, calculators, or even sliding rules, having what is known as a « sine table » was however of critical importance.

How did we find those values?