Navigation apparatus, computer program, screen displaying control method, and measurement interval control method

A method for controlling a screen displaying in a navigation apparatus that includes a detecting device that detects a movement condition of a movable body, and displays information for guiding the movable body through a route, on the basis of the detected movement condition and map data, the information being displayed on the screen,

• the method comprising:
• a determining process of determining whether the current situation allows an operator to look at the screen, on the basis of at least one of the detected movement condition and the map data;
• and
• a reducing process of reducing luminance of the screen or erasing the displayed information on the screen, when the current situation does not allow the operator to look at the screen.

A navigation apparatus comprising:

• a speed detecting device that detects a movement speed of a movable body and outputs speed data;
• a condition detecting device that detects a movement condition of the movable body except for the movement speed, and outputs condition data;
• a measuring device that measures the current position of the movable body, on the basis of the output speed data and the output condition data;
• and
• a measurement interval controlling device that controls a measurement interval of the measuring device in such a manner that the measurement interval becomes longer as the movement speed represented by the output speed data becomes lower,
• the navigation apparatus guiding the movable body through a route, on the basis of the movement condition and the current position of the movable body, and map data.

A computer program embodied in a computer-readable medium and representing a sequence of instructions, which when executed by a computer included in a navigation apparatus that includes:

• a speed detecting device that detects a movement speed of a movable body and outputs speed data;
• a condition detecting device that detects a movement condition of the movable body except for the movement speed, and outputs condition data;
• and a measuring device that measures the current position of the movable body, on the basis of the output speed data and the output condition data,
• the navigation apparatus guiding the movable body through a route, on the basis of the movement condition and the current position of the movable body, and map data,
• the instructions cause the computer to function as a measurement interval controlling device that controls a measurement interval of the measuring device in such a manner that the measurement interval becomes longer as the movement speed represented by the output speed data becomes lower.

A method for controlling a measurement interval in a navigation apparatus that includes:

• a speed detecting device that detects a movement speed of a movable body and outputs speed data;
• a condition detecting device that detects a movement condition of the movable body except for the movement speed, and outputs condition data;
• and a measuring device that measures the current position of the movable body, on the basis of the output speed data and the output condition data,
• the navigation apparatus guiding the movable body through a route, on the basis of the movement condition and the current position of the movable body, and map data,
• the method comprising a controlling process controlling of the measurement interval of the measuring device in such a manner that the measurement interval becomes longer as the movement speed represented by the output speed data becomes lower.