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NORTHSTAR FUNCTIONAL SPECIFICATION <br /> WO#120520 CAD/INMOTION MOBILE GATEWAY INTERFACE <br /> Section I: Automatic Vehicle Locator (AVL) <br /> The Automatic Vehicle Locator,or AVL,is a feature that allows NorthStar to <br /> plot the location of a vehicle that is equipped with a Global Positioning System <br /> (GPS)on the CAD map. <br /> The MMOTION Mobile Gateway sends NorthStar the unit's position in latitude <br /> and longitude and vehicle ID at a given time.NorthStar converts this data, <br /> received directly from the MMOTION Mobile Gateway into the projected <br /> coordinates used in the NorthStar system.NorthStar then plots the unit as an icon <br /> on the CAD map. <br /> How often NorthStar receives updates of the unit's position can be configured on <br /> the Mobile Gateway.NorthStar then updates the position of the unit on the map <br /> if the unit moves more than 300 feet(a configurable value). <br /> GPS Data Reception <br /> from the INMOTION Mobile Gateway <br /> The NorthStar interface listens for UDP datagrams on a configurable port. After <br /> the datagram is received,the interface interprets the TAIP sentence sent by the <br /> MMOTION Mobile Gateway. Since the protocol does not have the reliability of <br /> TCP/IP, some packets may be lost but this will not affect the operation of the <br /> system. <br /> Note: <br /> Configuration of the Mobile Gateway, including the assignment of the <br /> TAIP PV message type, the Vehicle ID, and the IP address and port <br /> number for Remote Forwarding to the Northstar interface is the <br /> responsibility of the client. Each Mobile Gateway must be configured <br /> wih an unique Vehicle ID corresponding to a valid Northstar unit. The <br /> client must also provide suitable interface devices such as cellular air <br /> cards or Wi-Fi cards and configure the Mobile Gateway's WAN <br /> connection to allow the UDP packets to be transmitted to the server <br /> hosting the CAD interface. <br /> 3-2 <br />