How To Erase Weak Echoes; How To Use The Cursor - Furuno CH-500 Operator's Manual

1. OPERATIONAL OVERVIEW
1.8.7

How to erase weak echoes

Weak echoes caused by interference from surface reflection and plankton can be
erased. This is particularly useful when you want to observe a school of fish clearly.
To erase weak echoes, do the following:
1. Press the MENU key to open the menu.
2. Press
3. Press
4. Press
Depending on the setting for [Echo Colors] in the [COM2] menu, the number of
colors available to erase changes.
[Echo Colors] setting
The default setting for all [Echo Colors] settings is [Off].
5. Press
echoes.
To color bar changes each time you press
ors you want to erase are removed.
Note: Use this function with caution. An excessively high setting can erase sea-
bed echoes, which can lead to grounding and other safety problems.
6. Press the MENU key to close the menu and apply the changes.
1.9

How to Use the Cursor

Use the Cursorpad to move the cursor. The cursor indication shows information for the
location of the cursor at all times and appears at the top-left corner of the display.
Depending on the display mode the following information can be displayed at the top-
left of the screen.
• Horizontal display mode: horizontal distance from own ship, depth and bearing.
• Vertical display mode: horizontal distance from own ship and depth.
• Echo sounder display mode: depth from own ship.
• Full-circle A-scope display mode: horizontal distance from own ship, depth and
bearing.
Note: When the cursor is placed on the own ship icon (center of the operational dis-
play area), the indications show a value of 0.
1-12
to select the menu bar.
or to select [COM2].
to select [Erase Color], then press
[Erase Color] range available
[32] Off (no echoes erased), 1 to 30
[16] Off (no echoes erased), 1 to 14
[8] Off (no echoes erased), 1 to 6
to select the echo colors to erase. A higher settings erases stronger
to show the [Erase Color] settings.
, allowing to make sure only the col-