Specifications

Operational procedures

857-164636 / Rev.A

How to zoom in on pelagic echoes

The VRM Expansion functions allows you to zoom in on

echoes in the water column.

When this function is active, the echo sounder presentation is

split in two. The upper part is the ordinary presentation, while

the lower part shows the expansion window with the echoes

over and under a reference depth.

Activate VRM Expansion

1 Make sure that your echo sounder presentation is in view.

2 Press the MENU button to open the main menu.

3 Open the Echo menu.

4 Select VRM expansion.

If your current window was not an echo sounder, you have now

closed it, and replaced it with an echo sounder with VRM

expansion. If you have an additional echo sounder page you will

need to enable the expansion mode for that page separately.

Change the reference depth

1 Press “up” and “down” on the Selector pad to change the

reference depth.

The depth you select will be stored by the echo sounder. The

next time you activate the VRM expansion mode, it will

autmatically use this reference value.

Change the range in the expansion window

1 Press the ENT button to open the Presentation setup.

2 Locate the Expansion window setting, and change to a

new value.

3 Press the ENT button save the setting and return to the

echo sounder view.

De-activate VRM Expansion

1 Press the MENU button to open the main menu.

2 Open the Echo menu.

3 Select Echo display.