In-vehicle system

An in-vehicle system comprising:

• a position information reception unit configured to receive position information from a satellite positioning system;
• a first control unit that includes the position information reception unit or is connected to the position information reception unit;
• a communication line connected to the first control unit;
• and
• a second control unit connected to the first control unit through the communication line, wherein
• the first control unit has a first conversion process unit configured to convert a datum of the position information,
• the first control unit is configured to convert a datum of the position information received by the position information reception unit by the first conversion process unit and to transmit the position information with the datum converted to the second control unit through the communication line.

An in-vehicle system comprising:

• a position information reception unit configured to receive position information from a satellite positioning system;
• a first control unit configured to use, as a first datum, only position information obtained from the position information reception unit;
• and
• a second control unit configured to receive from the first control unit the position information obtained from the position information reception unit and use the position information as a second datum.