Navigation system

An in-vehicle apparatus for installation in a vehicle and for display of navigation data provided from a data providing apparatus that (i) transmits to the in-vehicle apparatus the navigation data in accordance with a direction in which the vehicle heads;

• (ii) obtains from the in-vehicle apparatus first direction data which represents the direction in which the vehicle heads at a start of providing the navigation data;
• and (iii) derives second direction data which represents a direction in which the vehicle heads on the basis of a change of a location of the vehicle after a start of traveling of the vehicle, the in-vehicle apparatus comprising:
• an obtaining part that obtains the second direction data from the data providing apparatus;
• a storage part that stores during a stop of working of the in-vehicle apparatus the second direction data which is obtained;
• and
• a transmitting part that transmits the second direction data which is stored in the storage part to the data providing apparatus as the first direction data after activation of the in-vehicle apparatus.

A non-transitory computer-readable recording medium that stores a program executable by a computer included in an in-vehicle apparatus for display of navigation data provided from a data providing apparatus that (i) transmits to the in-vehicle apparatus the navigation data in accordance with a direction in which the vehicle heads;

• (ii) obtains from the in-vehicle apparatus first direction data which represents the direction in which the vehicle heads at a start of providing the navigation data;
• and (iii) derives second direction data which represents the direction in which the vehicle heads on the basis of a change of a location of the vehicle after a start of traveling of the vehicle, the program causing the computer of the in-vehicle apparatus to execute the steps of
• obtaining the second direction data from the data providing apparatus;
• storing the second direction data obtained in a storage part of the in-vehicle apparatus during a stop of working of the in-vehicle apparatus;
• and
• transmitting the second direction data stored in the storage part to the data providing apparatus as the first direction data after activation of the in-vehicle apparatus.

A navigation method using a navigation system including an in-vehicle apparatus for installation in a vehicle and a data providing apparatus for providing navigation data to the in-vehicle apparatus, the navigation method comprising the steps of:

• (a) the data providing apparatus obtaining from the in-vehicle apparatus first direction data which represents a direction in which the vehicle heads at a start of providing of the navigation data;
• (b) the data providing apparatus deriving second direction data which represents a direction in which the vehicle heads on the basis of a change of a location of the vehicle after a start of traveling of the vehicle;
• (c) the data providing apparatus transmitting to the in-vehicle apparatus the navigation data in accordance with a direction in which the vehicle heads;
• (d) the in-vehicle apparatus displaying the navigation data which is received from the data providing apparatus;
• (e) the data providing apparatus transmitting the second direction data to the in-vehicle apparatus;
• (f) the in-vehicle apparatus storing the second direction data which is received from the data providing apparatus in a storage part during a stop of working of the in-vehicle apparatus;
• and
• (g) the in-vehicle apparatus transmitting the second direction data which is stored in the storage part to the data providing apparatus as the first direction data after activation of the in-vehicle apparatus.