Abstract: A navigation apparatus includes an exit route determine unit and a route guidance unit. The exit route determination unit determines whether an exit route of a route guidance from a branch point corresponds to a learned road link. The route guidance unit provides route guidance by presenting a progress direction toward the exit route from the branch point in a first mode or a second mode. Per the first mode, the progress direction is based on an existing road link, and per the second mode, the progress direction is based on the existing road link and the learned road link. Accordingly, the route guidance unit presents the progress direction in: (i) the first mode when the exit route from the branch point does not correspond to the learned road link, and (ii) the second mode, when the exit route from the branch point corresponds to the learned road link.

Abstract: An image data update apparatus that can highlight a component with maintaining an appearance of an image to which anti-aliasing is applied and with suppressing increase in processing load is provided. When periodically changing a color arrangement of a traffic congestion line bordered using a color of black and displayed on a map image, only a central portion of the traffic congestion line is changed. Each time the color arrangement is changed, anti-aliasing is applied only to a boundary between the central portion and bordering portion but not to a boundary with a background map image.

Abstract: An image data update apparatus that can highlight a component with maintaining an appearance of an image to which anti-aliasing is applied and with suppressing increase in processing load is provided. When periodically changing a color arrangement of a traffic congestion line bordered using a color of black and displayed on a map image, only a central portion of the traffic congestion line is changed. Each time the color arrangement is changed, anti-aliasing is applied only to a boundary between the central portion and bordering portion but not to a boundary with a background map image.