5.Select OK to confirm the new setting. The new setting is applied immediately and stays until you change it again.

6.If you want to adjust the gain for the other frequency, repeat Steps 2 through 5.

7.When you are finished, select Return.

NOTE: If you're using fishing or cruising mode and adjust the gain yourself, the sounder automatically changes to manual mode.

18.3What is the gain threshold?

You can use the gain threshold to define the weakest echo (the minimum amplitude) that you want to show on your Sounder screen.

Each amplitude is associated with a particular color, so the gain threshold also controls the range of colors displayed.

If you set the gain threshold:

•too low, the maximum amount of colors are shown and background noise generated by factors such as planation and particulate matter may be shown as confusing random pixels.

•too high, there won't be enough useful detail about the bottom and echoes from some objects won't be shown.

Ideally, you should set the gain threshold at a level just above the background noise.

If you're in fishing mode or cruising mode the sounder adjusts the gain threshold automatically.

18.4Change the gain threshold

The gain threshold line is shown on the advanced A-scope screen as a thin white vertical line. You may find it useful to view this screen while you adjust the gain threshold.

You can adjust the gain threshold for the 50 kHz and 200 kHz independently of each other. The default for both is 0.

To change the gain threshold:

1.Display the Sounder screen and the control panel. If you can't see the

Gain and Filters button, select Return.

2.Select Gain and Filters, then select one of:

ƒ200 kHz Threshold if you want to adjust the gain threshold for the 200 kHz frequency or for a Mixed frequency.

ƒ50 kHz Threshold if you want to adjust the gain threshold for the 200 kHz frequency

3.A slider box appears. The current setting is shown as a line within a solid box of color and as a percentage.

4.Drag the line, or use the rotary knob, to change the gain threshold.

5.Select OK to confirm the new setting. The new setting is applied immediately and stays until you change it again.

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NorthStar Navigation 8000I operation manual What is the gain threshold?, Change the gain threshold
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8000I specifications

The NorthStar Navigation 8000i is a sophisticated marine navigation solution designed to enhance the safety and efficiency of marine operations. Utilizing the latest technology and innovative features, the 8000i provides users with a comprehensive navigation tool that is both user-friendly and highly reliable.

At the heart of the NorthStar 8000i is its advanced GPS integration, which delivers precise positioning and navigation capabilities. The system supports multiple satellite systems, allowing for exceptional accuracy and reliability in determining a vessel's location, even in challenging conditions. The 8000i uses Differential GPS (DGPS) to further improve positional precision, making it suitable for commercial vessels and recreational boaters alike.

One of the standout features of the NorthStar 8000i is its large, high-resolution color display, which presents information in a clear and accessible manner. The screen offers customizable layouts, allowing users to prioritize the data they find most critical. The interface is designed with simplicity in mind, enabling users to access navigation tools, charts, and other features quickly and easily.

The NorthStar 8000i is equipped with advanced cartography options, including support for a variety of chart formats. Users can choose between vector and raster charts, ensuring that they can find the best option for their specific needs. The system also supports both local and regional data, providing an extensive coverage area for vessels operating in different waters.

In terms of connectivity, the 8000i features integrated networking capabilities, allowing it to interface seamlessly with other marine electronics such as radar systems, autopilots, and AIS transceivers. This interoperability enhances situational awareness and provides a comprehensive picture of the marine environment around the vessel.

The rugged design of the NorthStar 8000i ensures that it can withstand the challenging conditions often encountered at sea. Built to be weatherproof and durable, this navigation system is ready for any marine adventure.

To summarize, the NorthStar Navigation 8000i combines cutting-edge GPS technology with user-friendly designs and exceptional features, making it a top choice for navigators seeking reliable marine navigation solutions. With its accuracy, customizable interfaces, and robust construction, the 8000i is engineered to meet the diverse needs of modern sailors, whether for leisure or professional undertakings.
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