NorthStar Navigation 8000I operation manual Select 50 kHz, 200 kHz or mixed frequency screen

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Narrow angle, more detailed 200 kHz cone Wide angle, less detailed 50 kHz cone Mixed frequency coverage

16.11Select 50 kHz, 200 kHz or mixed frequency screen

You can display a single frequency or a mixed frequency Sounder screen. 200 kHz is the default. (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) .

To select the sonar frequency:

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

Frequency button, select Return.

2.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:

ƒ50 - 50 kHz is particularly useful in deep water, typically greater than 500 ft (150 m) as it produces a good overview of area.

ƒ200 - 200 kHz is particularly good in shallow and medium water, typically less than 500 ft (150 m) or while you're running at speed.

ƒMixed - combines both frequencies on one display screen.

3.Select the new setting. The new setting is shown immediately and stays until you change it again.

16.12Select 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.

To show the split 50/200 screen:

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

Range, Zoom and Split button, select Return.

2.Select Range, Zoom and Split. The View Mode button shows the current setting.

3.Select the button if you want to change the setting and a drop down list of choices appears.

4.Select 50/200. The Sounder screen changes to show:

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