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Assurance of intercommunication and position recognition between mobile stations with navigation apparatuses

  • US 6,002,345 A
  • Filed: 09/23/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 09/30/1996
  • Status: Expired due to Term
First Claim
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1. A navigation apparatus to which radio communication means for performing a radio communication between mobile stations is connected, comprising:

  • first position recognition means for recognizing a current position of an own mobile station that mounts an own navigation apparatus on the basis of received GPS signal;

    current position transmitting means for transmitting the current position of the own mobile station recognized by said first position recognition means via said radio communication means;

    second position recognition means for recognizing a current position of an other mobile station that mounts an own navigation apparatus on the basis of radio signal received by said radio communication means;

    electric field strength detection means for detecting an electric field strength of the radio signal received from the other mobile station by the radio communication means;

    display means for displaying the recognized current positions of the own mobile station and the other mobile station together with stored map information; and

    warning means for generating a warning when the electric field strength detected by said electric field strength detection means is smaller than a predetermined value.

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