Abstract: A map display method in a navigation system has a bird's-eye view display function of displaying a map image in conjunction with a background image. The map display method in a navigation system has a step of displaying a horizon that indicates a boundary between the map image and the background image, and is rounded at least in part. Besides the bird's-eye view display effect, the method can enhance a sense of realism of the bird's-eye view display. Thus, it can solve a problem of a conventional method in that the bird's-eye view display effect cannot be achieved satisfactorily because the conventional method displays a pseudo horizon in a straight line to indicate the boundary between the map image region and the background image region.

Abstract: A map display method in a navigation system has a bird's-eye view display function of displaying a map image in conjunction with a background image. The map display method in a navigation system has a step of displaying a horizon that indicates a boundary between the map image and the background image, and is rounded at least in part. Besides the bird's-eye view display effect, the method can enhance a sense of realism of the bird's-eye view display. Thus, it can solve a problem of a conventional method in that the bird's-eye view display effect cannot be achieved satisfactorily because the conventional method displays a pseudo horizon in a straight line to indicate the boundary between the map image region and the background image region.

Abstract: A resinoid grinding wheel of the present invention has low grinding resistance and is capable of providing a ground workpiece excellent in ground surface quality without burn mark while maintaining essential properties of the resinoid grinding wheel such as low elastic modulus and strong force for holding abrasive grains. A typical resinoid grinding wheel of the present invention includes 25 parts by volume of Al2O3 abrasive grains with grain size of #150, 20 parts by volume of organic hollow material with average particle diameter of 80 &mgr;m, and 10 parts by volume of pores having 1 mm in size. They are all dispersed in 40 parts by weight of a bond made of cured epoxy resin.

Abstract: Determination is made as to whether or not a self-diagnostic tester 13 is connected with a K line 14. When the result of the determination indicates that the self-diagnostic tester 13 is not connected with the K line 14, data indicating vehicle-operating conditions are obtained from an engine ECU 11 and the like through a K line 14.

Abstract: A resinoid grinding wheel of the present invention has low grinding resistance and is capable of providing a ground workpiece excellent in ground surface quality without burn mark while maintaining essential properties of the resinoid grinding wheel such as low elastic modulus and strong force for holding abrasive grains. A typical resinoid grinding wheel of the present invention includes 25 parts by volume of Al2O3 abrasive grains with grain size of #150, 20 parts by volume of organic hollow material with average particle diameter of 80 &mgr;m, and 10 parts by volume of pores having 1 mm in size. They are all dispersed in 40 parts by weight of a bond made of cured epoxy resin.

Abstract: A navigation device comprises a traffic information receiving means (103) for receiving traffic information, and a display form controlling unit (107) for displaying a traffic-jam indicating line along a road in a traffic jam on a road map displayed on a display device (106), and for changing display forms, such as the colors or widths, of either roads or traffic-jam indicating lines on the road map on-screen when the display form controlling unit determines from the traffic information received that a number of links each of which are respectively connecting two nodes such as intersections and includes a congested road section is equal to or more than a predetermined number or when the scale of the road map displayed on the display device is smaller than a predetermined scale.

Abstract: A traffic information display unit having a road type associated traffic information display mode control unit for altering the display mode of a traffic information representation in accordance with the type of a road associated with the traffic information. Alternatively, it may have a traffic information additional symbol adding unit for adding a traffic information additional symbol indicating the direction of a road associated with an accident/regulation information. Those make it possible to solve conventional problems in that a driver must manipulate a switch each time he wishes to distinguish the traffic information representation of an expressway from that of a local road, or that he cannot recognize lane in which the accident/regulation takes place because the traffic information representation of the accident/regulation information was a simple symbol on the road without showing the direction.