To make the starter: Mix everything together to make a soft dough and place in a bowl. Cover with a dish towel and let rest at room temperature for about 14 hours or over night. The starter should expand and become bubbly. It will flatten out over the 14 hours and even dry out a little on top. That's ok.
Next make the dough. Mix and knead everything together. Most landlubber bakers use a stand mixer with a dough hook. But not so galley pirates. We mix by hand, the way it used to be done.
And mix... and knead... and mix... and knead. My Skipper recommends kneading for 12 minutes if you do it by hand.
Grease a metal bowl or pan and place the dough in the pan. The dough need to rise in a somewhat warm place; about 80º is perfect.
Let rise for 45 minutes.Then punch the dough down a bit and fold its edges into the center, then turn it over in the bowl before letting it rise for an additional 45 minutes, until it's noticeably puffy.Turn the dough out onto a lightly greased work surface. Gently deflate it, and divide it into three equal pieces. Flatten each piece of dough slightly then fold it almost in half, sealing the edges with the heel of your hand. Turn the dough around, and repeat: fold, then flatten. Repeat this whole process again for each of the three pieces of dough. Cover with greased plastic wrap and let rest for a minimum of 15 minutes or up to an hour.
Roll each piece of dough into a 15" "baguette" roll. Place the three rolls on a baking sheet lined with parchment paper. Let rise for another 45 minutes.
If your galley oven was already lit to warm the galley and assist in the dough rising, you can now crank the temperature up to as high as your oven will go. 450º is what you are aiming for. Place a cast iron pan on the floor of your stove. Once your stove heats up you will carefully fill the pan with water.
Once your 3 baguettes have risen place them on a parchment-lined baking sheet. Score the baguettes at a 45º angle with a very sharp knife.
Place the baguettes in the hot oven for 25-30 minutes. If your oven is not hot enough, increase the time for another 10-15 minutes until they start to brown. If they still do not brown, carefully light the broiler and broil...moving the baguettes around by moving the parchment paper for not more than 5 minutes or until golden.
Turn off the oven and let them rest there for another 15 minutes before serving.