1.13Erasing Weak Echoes
Sediment in the water or reflections from plankton may be painted on the display in low intensity tones.
Weak echoes
Appearance of weak echoes
These weak echoes may be erased as follows:
1.Press the [MENU/ESC] key to open the menu.
2.Use ▲ or ▼ to choose SIGNAL LEVEL from page 1 of the menu.
3.Press ► to show the options window.
4.Use ▲ or ▼ to choose the degree of suppression desired; Off, Low, or High (highest).
5.Press the [MENU/ESC] key to close the menu.
6.To turn off the signal level function, choose "Off" at step 4 and then press the [MENU/ESC] key.
1.14 White Line
The white line feature displays a leading edge of the bottom echo in white. This is useful for discriminating bottom fish near the bottom.
1.Press the [MENU/ESC] key to display the menu.
2.Use ▲ or ▼ to choose WHITE LINE from page 1 of the menu.
3.Press ► to show the options window.
4.Use ▲ or ▼ to choose Off, Tone or Mesh as appropriate. “Mesh” paints the white line in darker tone than “Tone.”
5.Press the [MENU/ESC] key to close the menu.
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How white line works
1.15 Waypoints
Waypoints may be used to:
•Record the latitude and longitude position of an important echo. 12 points may be registered.
•Output a waypoint position to a plotter to mark position on its screen
•Find range, bearing and
Note: Requires latitude and longitude position from a navigator.
Registering a waypoint on the screen
1.Press the [MARK] key. The cursor appears along with waypoint entry instructions.
Note: If there is no position data the message “No position data!” appears. Check the navigator.
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[MENU] Cancel |
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