SECTION TWO - Installation

Once the unit is turned on and has acquired satellite data, you can check the quality of the GPS signals being received by viewing the various satel- lites’ SNR (Signal-to-Noise Ratio) readings.

GPS receiver status summary

To display information about the GPS satellites, press the STAR key to display the SERVICE MENU screen, then press the GPS STATUS key. The 961 displays the GPS SATELLITE STATUS screen, showing the status of the GPS receiver. This screen also displays the status of the DGPS receiver, if installed (961XD).

Figure 22: GPS satellite status screen

The GPS SATELLITE STATUS screen shows the received Signal-to-Noise Ratio (SNR) for each satellite (up to 12), and a map indicating where the satellites are now located in the sky. Satellites are identified by their pseu- dorandom number (PRN), a two-digit number assigned by the U.S. gov- ernment. The center of the satellite map represents the center of the sky, and the outer ring is the horizon. The view is looking down from above, with East to your right and West to your left.

Also displayed on the screen is the following GPS data:

•ACCURACY

•HDOP (horizontal dilution of precision)

Accuracy is the estimated accuracy of the GPS system to be expected at the current time. Your position readings should be more accurate than this estimate 95 percent of the time.

HDOP is a technical measure of how good the satellite pattern is in the sky for fix-taking purposes. HDOP depends on how many operational sat- ellites are in view and where they’re currently located. HDOP is calcu- lated from the satellites’ current positions, not on actual received signals,

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NorthStar Navigation 961XD installation manual GPS receiver status summary, Accuracy
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961X, 961XD specifications

NorthStar Navigation has long been a leader in marine navigation systems, and the NorthStar 961XD and 961X are no exceptions. These cutting-edge devices bring advanced navigation capabilities to both recreational boaters and professional mariners, ensuring precise positioning and enhanced safety on the water.

The NorthStar 961XD is equipped with a powerful GPS receiver that delivers exceptional accuracy, even in challenging environments. This is achieved through a combination of differential GPS (DGPS) technology and support for WAAS (Wide Area Augmentation System). These features enable users to achieve positioning accuracy within a few meters, which is crucial for safe navigation in crowded or complex marine environments.

One of the standout features of the NorthStar 961XD and 961X is their intuitive user interface. The devices boast a large, high-resolution color display that provides clear visibility in various lighting conditions, including bright sunlight. The menu-driven system allows users to quickly access essential functions, making it easy to plot courses, set waypoints, and track routes on the go.

Both models support advanced charting capabilities, including the ability to display vector and raster charts. The chart database can be easily updated via USB, ensuring that users have access to the latest navigational information. This is particularly important for long-distance cruisers navigating through unfamiliar waters.

Another significant feature of the NorthStar 961XD and 961X is their integrated fishfinder capabilities. With sonar technology, users can locate fish, understand the underwater topography, and enhance their fishing experience. This dual functionality makes the devices versatile companions for both navigation and hunting for the next big catch.

Connectivity is another important aspect of the NorthStar systems. Both models feature multiple connectivity options, including NMEA 0183, allowing seamless integration with other onboard electronics such as autopilots, radars, and AIS systems. This enhances the overall situational awareness and safety of the vessel.

Finally, the rugged design of the NorthStar 961XD and 961X ensures they can withstand the harshest marine environments. With water-resistant housing and durable construction, these devices are built to last, providing reliable performance year after year.

In summary, the NorthStar 961XD and 961X deliver a winning combination of advanced navigation technologies, user-friendly interfaces, integrated fishfinding capabilities, and robust construction. These features make them indispensable tools for anyone serious about safe and efficient navigation on the water.
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