Assurance of intercommunication and position recognition between mobile stations with navigation apparatuses
 The communication state is evaluated on the basis of the current positions, velocities, and moving directions included in information obtained from another mobile station by radio communications and information of the own mobile station, and the electric field strength Bi of the radio communications (S31 to S34). When the obtained evaluation value is smaller than the relative distance Li between the mobile stations (S35), processing for generating a message in the own mobile station is done in correspondence with the current position (S36 to S42), or processing for generating a message in the other mobile station is done in correspondence with the direction the other mobile station is traveling (S43 to S48). 
Mazda Motor Corporation
G G G G
G01C G01S G01S G08G
inventional inventional additional inventional
Hiroshi Hideaki Koji
Ohmura Kikuchi Hosoda