Gps speed limiter.Other applications of GPS navigators

　　1. Autonomous navigation

　　The autonomous navigation system is suitable for any of the five routes mentioned above. It is basically a simple navigation system, and its main feature is to only provide users with position, speed, heading, and time information. It can also include chart and track display, without the need for a communication system. Suitable for sailing on any sea, lake, or inland waterway, from large ocean going cargo ships to private yachts.

　　2. Port management and entry guidance

　　This system is mainly used for ship dispatch and management at ports/docks, as well as guidance for incoming ships, to ensure the safety and order of navigation at ports/docks. The system requires bidirectional data/voice communication to facilitate navigators guiding ships; Port area scenario/chart display to indicate anchored vessels and available entry routes to avoid collisions. This system requires high accuracy for navigation systems and requires the use of differential GPS and other enhancement technologies.

　　3. Airline Traffic Management System

　　This type of system is similar to 2, but mainly used for ship navigation and management on nearshore and inland river routes, usually requiring support from satellite communication systems such as INMARSAT.

　　4. Tracking and monitoring system

　　This type of system is mainly used for maritime patrol boats, anti smuggling boats, and various yachts, especially private yachts, to prevent theft. Depending on the specific user, some systems require navigation parameters and bidirectional data/voice communication, such as anti smuggling boats. Sometimes, navigation parameters do not need to be provided, such as for private yacht theft prevention, which only requires one-way data communication. Once theft occurs, the navigation system on the yacht continuously sends its position and heading to the relevant center for tracking.

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The following aspects mainly affect the performance of GPS antenna