Road map display system with indications of a vehicle position and destination

A road map display system for an automotive vehicle comprising:

• a first memory storing map image data arranged in a map coordinate system having an x-axis and a y-axis;
• a first sensor for detecting the position of a vehicle in said map coordinate system and producing a first sensor signal representative of the detected vehicle position;
• a second sensor for detecting the direction of vehicle travel and producing a second signal representative of the angular offset between the detected direction and the axes of the map coordinate system;
• first means for determining the map coordinates of a destination and producing a third signal representative of the position of the determined destination;
• second means for determining the origin of a second coordinate system having an x-axis and a y-axis in accordance with both said first sensor signal and said third signal and aligning the y-axis of said second coordinate system parallel to the detected direction of travel;
• third means for transforming the coordinates of said map image data in said first memory to said second coordinate system;
• a second memory storing at least part of the map image data in the second coordinate system;
• and
• fourth means, incorporating a display screen, for displaying the map image data stored in said second memory and symbols representing the information indicated by said first, second, and third signals.