In the middle of the ocean the navigating officer took out his sextant to take the sun’s altitude. To the uninitiated, it must seem a magical thing. Peering through small binoculars, moving a lever back and forth, turning a small wheel and watching the clock. After the calculations in the chartroom and the murmurings about degrees, minutes, seconds and altitude lines, it appears that the magical formula works. All these actions together form a ritual that always come to the same conclusion: Here we are!, in which ‘here’ is a spot on the chart under the index finger.