Setting beacon frequency and baud rate

SECTION FOUR - Service/Maintenance

You can set the receiver to operate automatically or be controlled manu- ally.

Automatic tuning

Northstar’s two-channel differential receiver enters automatic differential mode as soon as corrections are received, and doesn’t require any further supervision for differential operation, automatically tuning to the appro- priate differential frequency as you move from one differential coverage area to another or as weather conditions change. First, it finds the differ- ential frequency and data transfer (baud) rate, then it receives data fully automatically. The receiver constantly evaluates available radio beacon signals for signal quality, and selects only the best station. The receiver is prepared to switch to another frequency automatically, as you travel, as conditions require.

The unit maintains automatic operation by using its two independent receiver channels: Channel 1 tracks the best available differential signal (the one with the lowest data error rate) and sends the demodulated DGPS corrections to the 961’s GPS receiver. Channel 2 continuously scans the entire differential frequency band (283.5 to 325 kHz), locating and measuring received DGPS differential signals, which is then stored as a DGPS differential directory in its battery-powered memory.

If the signal that’s received and monitored by Channel 1 degrades for any reason, such as bad weather between you and the transmitter, the unit tries to select a better frequency from the differential directory it has compiled. This feature enables it to switch to the best differential sig- nal—beforeaffecting your GPS accuracy.

For normal operation, Northstar recommends that you leave both beacon frequency and baud rate at the AUTO setting. Generally, you’ll use auto- matic mode for everything except specialized applications.

To choose automatic mode:

1.At the RECEIVER INFORMATION screen, press the CURSOR PAD to highlight the BEACON FREQ field, then press the EDIT key.

2.Press the CURSOR pad left to highlight the AUTO field, then press the ACCEPT key (or CANCEL to leave the option unchanged).

Manual tuning

You can override the receiver’s selection of automatic differential stations at any time. Under manual control, you manually set the differential fre- quency and baud rate to tune in a particular differential transmitter. In manual mode, the differential receiver outputs DGPS corrections only from the selected station. Although the need for manual operation is rare, it is easily accessed at the RECEIVER INFORMATION screen. Here, you

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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.