Furuno 1823C manual Advancement synchronized with ship’s speed

4. VIDEO SOUNDER OPERATION

4.10.2Advancement synchronized with ship’s speed

With speed data provided by a speed-measuring device, picture advance speed may be set according to ship’s speed, the ship’s speed dependent mode. As shown in the figure below the horizontal scale of the display is not influenced by the change of ship’s speed, thus the speed-dependent picture advance permits judgment of fish school size and abundance at any speed. The choice “SPD SENSING PRR” means the ship’s speed dependent mode, where the PRR changes automatically with ship’s speed.

Fish school shrinks as speed is increased; expanded

as speed is decreased.

Same size fish schools

FULL HALF

Speed SPEED SPEED

Actual Movement

Normal Mode

Fish schools are shown same size regardless of ship’s speed.

Speed-Dependent Picture Advance Mode

How the speed-dependent picture advance mode works

Activating/deactivating the speed-dependent picture advance mode

1.Press the [MENU] key followed by the SOUNDER MENU soft key.

2.Select PRR LEVEL.

3.Press the EDIT soft key to open the setting window.

4.Use the trackball to select SPD SENSING PRR.

5.Press the RETURN soft key followed by the [MENU] key to close the menu.

Note: Use the same speed data sentence (STG or STW) throughout the network for smooth advancement of the sounder picture. See the paragraph 6.5 for how to output data through the network.

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