Furuno CH-270 - Manual (Page 71)

3. VERTICAL SCAN MODE
3-17
3.12 Interpreting the Vertical Scan Display
This section provides information necessary for interpreting the vertical scan display.
3.12.1 Sample echo displays
Port-starboard picture
You can see fish echoes at the center-right of the screen. The bottom is displayed wider
as the distance from the ship’s position increases. Therefore, it may be difficult to
discriminate bottom fish.
Fish
school
Own ship
PORT STBD
Bottom
Port-starboard picture
When ship passes over fish schools
The sounding beam is directed fore-aft and the display is off-centered* to present a wider
view of the area forward of the ship. You can clearly see fish schools approaching from the
bow of the ship.
*: Automatically off-centered.
FORE AFT
FORE AFT
Fish
school
Fish
school
Forward Own ship
Picture appearance when passing over fish schools