Americanresearchers have managed to modify the signalsGPS (Global Positioning System) by sending ahundred meters from the yacht's itinerary being"cheated" crew that he adhere to the right path."We all imitate GPS-s group. To confuse the yachtGPS system, researchers must generate false signals that were different from those truths.Theoretically, the navigation system will acceptsignals, but the location was not that accurate.When met with real signals on the receiver, theywere stronger ours. "A common GPS receiversbased on signals from at least four satellites, butaccuracy improves by increasing the number of satellites. In the ocean can be achieved signals from 10satellites simultaneously. Knowing the location of each satellite and the exact time when the signal arrives, it is possible to determine the location of the receiver with an accuracy measured in meters. GPS works by measuring the signals received from satellites that are in orbit 20 000 km above the Earth. If a satellitesignal will only be false, then the system can not exclude being consistent with the signals coming fromother satellites. If half of them are not accurate, then the system starts "doubt".