User manual NORTHSTAR 8000I

[. . . ] Northstar 8000i System Operation Manual www. northstarnav. com Important Safety and Warning Information IMPORTANT SAFETY INFORMATION Please read carefully before use This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety measures that follow this symbol to avoid possible injury or death. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. [. . . ] This can be useful if you're trying to identify the type of bottom and/or locate individual fish. It's also the best choice for reducing shadows when you're fishing in areas with hollows, rocks and ledges. Mixed - combines both frequencies on one display screen. This can be useful if you're not getting good displays from a single frequency, because it uses the best return signals that are available from either frequency. However, the mixed frequency produces a much slower scroll speed compared to a single frequency. 106 Northstar 8000i Operation Manual A B A+B Narrow angle, more detailed 200 kHz cone Wide angle, less detailed 50 kHz cone Mixed frequency coverage 16. 11 Select 50 kHz, 200 kHz or mixed frequency screen You can display a single frequency or a mixed frequency Sounder screen. (If you want to see both frequencies on a split display screen, with the 50 kHz returns in one pane and the 200 kHz returns in the other pane, (see "Select a split 50/200 kHz screen" page 107) . If you want more information about choosing a frequency to suit your local environment and activity, (see "When to use 50 kHz, 200 kHz, or mixed frequency" page 106) . Display the Sounder screen and the control panel. If you can't see the Frequency button, select Return. The Frequency button shows the current setting. Select the button if you want to change to another setting and a drop down list appears. There are three choices: 50 - 50 kHz is particularly useful in deep water, typically greater than 500 ft (150 m) as it produces a good overview of area. 200 - 200 kHz is particularly good in shallow and medium water, typically less than 500 ft (150 m) or while you're running at speed. Mixed - combines both frequencies on one display screen. The new setting is shown immediately and stays until you change it again. 16. 12 Select a split 50/200 kHz screen You can show the 50 kHz history in one pane and the 200 kHz history in the other. This can be useful if you're operating in shallow to medium water, typically less than 500 ft (150m), and want to compare a wide view of the local area (50 kHz) with a more detailed view of the area under your vessel (200 kHz). NOTE: You can't use any of the zoom features on this screen. Display the Sounder screen and the control panel. If you can't see the Range, Zoom and Split button, select Return. The View Mode button shows the current setting. Select the button if you want to change the setting and a drop down list of choices appears. The Sounder screen changes to show: Northstar 8000i Operation Manual 107 The 200 kHz history in the right hand pane The 50 kHz history in the left hand pane 5. [. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 What does the sounder screen show?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 What does the sounder status bar show?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 What is a radar guard zone?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 What is auto range and range shift?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 What is gain?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114, 120 What is rain clutter? [. . . ]