Navigation device

A navigation device comprising:

• a means for detecting present location;
• a means for obtaining information concerning an area to be avoided;
• a means for setting a departure point and a destination;
• a route search means for searching for a route A from said departure point to said destination;
• a bypass route search means for searching for a route B that starts from a branch point on said route A on a near side of said area to be avoided and bypasses said area to be avoided, when said route A passes through said area to be avoided;
• and
• a guidance means for displaying that the area to be avoided exists, when the present location moves to a predetermined distance before said branch point.

A navigation device comprising:

• a means for detecting present location;
• a means for obtaining information concerning an area to be avoided;
• a means for setting a departure point and a destination;
• a route search means for searching for a route A from said departure point to said destination;
• a bypass route search means for searching for a route B that starts from a branch point on said route A on a near side of said area to be avoided and bypasses said area to be avoided, when said route A passes through said area to be avoided;
• and
• a guidance means for displaying said route B, when the present location moves to a predetermined distance before said branch point.

A navigation device comprising:

• a means for detecting present location;
• a means for obtaining information concerning an area to be avoided;
• a means for setting a departure point and a destination;
• a route search means for searching for a route A from said departure point to said destination;
• a bypass route search means for searching for a route B that starts from a branch point on said route A on a near side of said area to be avoided and bypasses said area to be avoided, when said route A passes through said area to be avoided;
• and
• a guidance means, which:
• gives guidance using said route A, until the present location moves to a predetermined distance before said branch point;
• displays that the area to be avoided exists, when the present location moves to a predetermined distance before said branch point;
• gives guidance using the route A when the present location is on the route A even after passing said branch point;
• and
• gives guidance using the route B when the present location is on the route B after passing said branch point.

A navigation device comprising:

• a means for detecting present location;
• a means for obtaining information concerning an area to be avoided;
• a means for setting a departure point and a destination;
• a route search means for searching for a route A from said departure point to said destination;
• a bypass route search means for searching for a route B that starts from a branch point on said route A on a near side of said area to be avoided and bypasses said area to be avoided, when said route A passes through said area to be avoided;
• and
• a guidance means which:
• gives guidance using said route A, until the present location moves to a predetermined distance before said branch point;
• receives an instruction on whether the route B should be used for guidance, when the present location moves to the predetermined distance before said branch point;
• gives guidance using the route B when the instruction to use the route B for guidance is received;
• and
• gives guidance continuously using the route A when the instruction to use the route B for guidance is not received.