With modern GPS, we often don’t think too hard about how to navigate, but GPS does not work very well on the open sea. That is why modern ships are equipped with technology such as radar and a ...

the chronometer and the compass - all of them doing a part of the job that the single astrolabe could do alone. Tomorrow we're far south of Spain, way beyond the reach of our astrolabe ...

the chronometer and the compass - all of them doing a part of the job that the single astrolabe could do alone. Tomorrow we're far south of Spain, way beyond the reach of our astrolabe ...