Display method and apparatus for navigation system

Claim 2

A display method for a navigation system, comprising the following steps of: displaying a guidance map for guiding a user to a destination by indicating a maneuver point on the route and a direction of turn at the maneuver point; detecting a plurality of maneuver points in succession on the route to the destination and applying a test condition to the maneuver points based on geometry of the maneuver points; adjusting a number of maneuver points to be displayed on the guidance map as a result of applying the test condition to the maneuver points; and enlarging a size of the guidance map while including the adjusted number of maneuver points in the guidance map; wherein said test condition includes a test condition (1) which determines L (n, n+1 ≦L max , where L (n, n+1) is a drive length along a street between two adjacent maneuver points P n and P n+1 , and L max is a maximum allowable drive length of the a street between the two adjacent maneuver points and a test condition (2) which determines L (n, n+1) ≦K D D (1, 2) , where D (1, 2) is a straight-line length between a first maneuver point P 1 and a second maneuver point P 2 , and K n is a relative factor for determining maximum allowable straight-line maneuvers.

Claim 3

A display method for a navigation system as defined in claim 1 , wherein said step of enlarging said guidance map including a step of maximizing the size of the guidance map while including all of the adjusted number of maneuver points.

Claim 4

A display method for a navigation system as defined in claim 1 , said test condition (2) is modified so that the test condition (2) determines D (n, n+1) ≦K DD D (1, 2) , where D (n, n+1) is a straight-line length between two adjacent maneuver points P n and P n+1 , and K DD is a relative factor for determining maximum allowable straight-line maneuvers.

Claim 5

A display method for a navigation system as defined in claim 3 , said K DD is about 3-5.

Claim 6

A display method for a navigation system as defined in claim 1 , said test condition includes a test condition (3) which determines L (n, n+1) ≦K LD D (n, n+1) , where D (n, n+1) is a straight-line length between the two adjacent maneuver points P n and P n+1 , and K LD is a relative factor for determining a maximum drive length with respect to the straight-line distance.

Claim 7

A display method for a navigation system as defined in claim 5 , said K LD is about 1.5-2.

Claim 8

A display method for a navigation system as defined in claim 1 , said test condition includes a test condition (4) which determines D (1, n+1) ≦D max , where D (1, n+1) is a straight-line distance between a first maneuver point P 1 and a farthest maneuver point P n+1 , and D max is a maximum allowable distance between the first maneuver point P 1 and the farthest maneuver point P n+1 .

Claim 9

A display method for a navigation system as defined in claim 1 , said test condition includes a test condition (5) which determines m≦M max , where m is a number of maneuvers in succession, and M max is a maximum allowable number of maneuver points that can simultaneously appear on guidance map.

Claim 10

A display method for a navigation system as defined in claim 8 , said M max is about 4-5.

Claim 11

A display method for a navigation system as defined in claim 1 , said L max is about 200-300 meters.

Claim 12

A display method for a navigation system as defined in claim 1 , said K D is about 3-5.

Claim 13

A display apparatus for a navigation system, comprising: means for displaying a guidance map for guiding a user to a destination by indicating a maneuver point on the route and a direction of turn at the maneuver point; means for detecting a plurality of maneuver points in succession on the route to the destination and applying a test condition to the maneuver points based on geometry of the maneuver points; means for adjusting a number of maneuver points to be displayed on the guidance map as a result of applying the test condition to the maneuver points; and means for enlarging a size of the guidance map while including the adjusted number of maneuver points in the guidance map; wherein said test condition includes a test condition (1) which determines L (n, n+1) ≦L max , where L (n, n+1) is a drive length along a street between two adjacent maneuver points P n and P n+1 , and L max is a maximum allowable drive length of the a street between the two adjacent maneuver points and a test condition (2) which determines L (n, n+1) ≦K D D (1, 2) , where D (1, 2) is a straight-line length between a first maneuver point P 1 and a second maneuver point P 2 , and K D is a relative factor for determining maximum allowable straight-line maneuvers.

Claim 14

A display apparatus for a navigation system, comprising: means for displaying a guidance map for guiding a user to a destination by indicating a maneuver point on the route and a direction of turn at the maneuver point; means for detecting a plurality of maneuver points in succession on the route to the destination and applying a test condition to the maneuver points based on geometry of the maneuver points; means for adjusting a number of maneuver points to be displayed on the guidance map as a result of applying the test condition to the maneuver points; and means for enlarging a size of the guidance map while including the adjusted number of maneuver points in the guidance map; wherein said test condition includes a test condition (1) which determines L (n, n+1) ≦L max , where L (n, n+1) is a drive length along a street between two adjacent maneuver points P n and P n+1 , and L max is a maximum allowable drive length of the a street between the two adjacent maneuver points and a test condition (2) which determines L (n, n+1) ≦K D D (1, 2) , where D (1, 2) is a straight-line length between a first maneuver point P 1 and a second maneuver point P 2 , and K D is a relative factor for determining maximum allowable straight-line maneuvers.

Claim 15

A display apparatus for a navigation system as defined in claim 12 , wherein said means for enlarging said guidance map maximizes the size of the guidance map while including all of the adjusted number of maneuver points.

Claim 16

A display apparatus for a navigation system as defined in claim 12 , said test condition (2) is modified so that the test condition (2) determines D (n, n+1) ≦K DD D (1, 2) , where D (n, n+1) is a straight-line length between two adjacent maneuver points P n and P n+1 , and K DD is a relative factor for determining maximum allowable straight-line maneuvers.

Claim 17

A display apparatus for a navigation system as defined in claim 14 , said K DD is about 3-5.

Claim 18

A display apparatus for a navigation system as defined in claim 12 , said test condition includes a test condition (3) which determines L (n, n+1) ≦K LD D (n, n+1) , where D (n, n+1) is a straight-line length between the two adjacent maneuver points P n and P n+1 , and K LD is a relative factor for determining a maximum drive length with respect to the straight-line distance.

Claim 19

A display apparatus for a navigation system as defined in claim 16 , said K LD is about 1.5-2.

Claim 20

A display apparatus for a navigation system as defined in claim 12 , said test condition includes a test condition (4) which determines D (1, n+1) ≦D max , where D (1, n+1) is a straight-line distance between a first maneuver point P 1 and a farthest maneuver point P n+1 , and D max is a maximum allowable distance between the first maneuver point P 1 and the farthest maneuver point P n+1 .

Claim 21

A display apparatus for a navigation system as defined in claim 12 , said test condition includes a test condition (5) which determines m≦M max , where m is a number of maneuvers in succession, and M max is a maximum allowable number of maneuver points that can simultaneously appear on guidance map.

Claim 22

A display apparatus for a navigation system as defined in claim 19 , said M max is about 4-5.

Claim 23

A display apparatus for a navigation system as defined in claim 12 , said L max is about 200-300 meters.

Claim 24

A display apparatus for a navigation system as defined in claim 12 , said K D is about 3-5.