HiFix

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HiFix is a method of radio navigation for localization and surveying near the coast. It works in a similar way to the GEE or Decca method of medium and long-range navigation with hyperbolic base lines.

The name stands for high precision fixing - in analogy to the term HiFi . HiFix was developed in the 1950s for offshore projects in the North Sea , in particular for hydrographic surveys and oil exploration . The interference of the radio waves (frequency around 2  MHz ) is made possible by a few fixed or transportable transmission masts near the coast at distances of a few dozen to a hundred kilometers. The accuracy is a few meters and can be increased to better than 1 m if the geometry is favorable.

In the 1970s and 1980s, HiFix was improved through radio-technical and analytical refinements and further developed by Sercel to create the Syledis precision process , which was widely used in France . It also enables precise location determination when the radio beacons are somewhat further away than the radio horizon , which increases the range and reduces installation costs. Since the 1990s, HiFix and Syledis have lost their importance due to the development of the GPS system.

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