P the invention makes it possible to automatically commute signaling devices mounted on board a ship to the approach of predetermined regions, where the underwater installations: cables and pipes or other, could be damaged. For this purpose, these zones are recorded in the form of digital data into the reader, magnetic strips 24, the reading circuits of the tracks 12, 13 and 14, are connected to the comparison circuits such as c16 which permanently receive the coordinates digital w, x, y, z, an indicator, the position of the ship. / p & & p & the invention applies to any system position indicator. / p
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