The present invention relates to a non-reception time detection system of a navigation system,;An MR element portion comprising an MR element A for measuring the Y direction of the vehicle, an MR element B positioned in the 90 degree direction with the MR element A, and an X element for measuring the X direction, and amplifying the output voltage of the MR element with the required precision. An amplifier and a microprocessor for converting the amplified value into a digital signal by an analog / digital converter, inputting the two signals, and performing an arctan operation on these two values to measure changes in the earth's magnetic field.;In areas with weak GPS signals such as tunnels, buildings, and mountainous areas, the non-receipt timing system using MR devices can provide accurate directions to the driver without losing the vehicle's location information.
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