| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide running-aground preventing support technology easily and precisely determining an intrusion into a prescribed zone. <P>SOLUTION: This running-aground prevention support device includes a position detecting device (101) detecting a present position, and a zone intrusion determination device (105) determining whether the present position intrudes a prescribed zone or not. The zone intrusion determination device (105) determines whether or not the present position is located within the zone based on the number of times when a line which extends from the present position to a prescribed direction crosses the boundary of the zone and, when determining that the present position is located within the zone, outputs a zone intrusion alarming signal (Sa). <P>COPYRIGHT: (C)2012,JPO&INPIT |
