Abstract: The error of the transmitters'position was the primary influence in navigation of the GPS AMBN (area-mapping deceivingunites battlefield navigation integrative system). The navigation error which was brought by the flat error and the time delay wasstudied firstly. Then, the compensatory algorithm of flat error was proposed. The error of the transmitters忆position was equivalentto the time-delay error of the transmitters'signal. The receiver could compensate the time delay in the navigation calculation. Theprecision of navigation could heighten by this way. In the end, the validity of the Algorithmic was validated by the simulate results.