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. 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. CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. [. . . ] Use the zoom range shift to move the zoom range up into shallower water or down into deeper water, so that you can show any section of the water column in detail. 16. 15 Change the zoom range shift This works only on a split sounder screen with a zoomed area. You must have Auto Range Off. 108 Northstar 8000i Operation Manual You can use the zoom range shift to move the zoomed area up or down to magnify any section of the water column between the bottom and the surface. If you can't see the Range, Zoom and Split button, select Return. Select: Shallower to zoom a different part of the water column, closer to the surface Deeper to zoom a different part of the water column, closer to the bottom 4. The new setting is applied immediately and stays until you change it again. Select OK to confirm the new setting. 16. 16 Select a split bottom lock screen Split bottom lock ensures that the bottom is always shown on the Sounder screen, regardless of any changes in depth. You can use the split bottom lock screen to zoom in on the bottom so that you can easily compare different echo strengths. This can be helpful if you're trying to identify the type of bottom or locate objects on or close to the bottom. If you can't see the Range, Zoom and Split button, select Return. Select the button if you want to change the setting and a drop down list of choices appears. The Sounder screen changes to show: The history in the right hand side with the bottom always in view The zoomed area of bottom in the left hand side The numbers at the top and bottom of the zoomed area show the extent of the zoomed area of bottom. The lower number may show a negative reading, indicating that this area lies within the bottom. NOTE: If the A-scope is already shown, this will also be shown on the split screens too. 16. 17 Change the ratio of a split screen You can use the split screen ratio to adjust the sizes of a split screen. Northstar 8000i Operation Manual 109 This option is available only on the split zoom, the split bottom lock, and the split 50/200 screens. If you want to change the ratio of an A-Scope screen (see "Change the ratio of the A-Scope" page 111), . If you can't see the Range, Zoom and Split button, select Return. The new setting is applied immediately and stays until you change it again. When you are finished, select Return. 16. 18 What is the A-Scope? You can use the A-Scope to analyze the sonar echoes in detail, so that you can optimize the gain (see "What is gain?" page 115)and the gain threshold levels (see "What is the gain threshold?" page 116) for the current sonar frequency. The A-Scope appears in the right side of your Sounder screen as a vertical column of multi-colored, horizontal lines that are constantly moving. The length of each horizontal line shows the strength of the echo at that particular depth. If you show the A-Scope, you can select a standard or an advanced A-Scope. The standard A-Scope shows the: · strong echoes as long horizontal lines · weak echoes as short horizontal lines The advanced A-Scope also shows: · a static thin red vertical line showing the maximum sonar amplitude. Any echoes that exceed this maximum are always shown in red · a white (or black) thin vertical line showing the selected minimum amplitude, which controls the range of colors displayed. [. . . ] 50 What does the C-MAP PRO Chart Manager screen show?. . . . . . . . . . . . . . . . . . . . . . . . . . . 37 What does the radar screen show?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 What does the radar status bar show?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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? [. . . ]