NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 42)

Page 38 491 Echo Sounder Operations Manual
In the large rectangle on the right, the blue area at the top
(with waves) represents the surface of the water, and the
brown area below represents the seabed.
The number at the bottom is the depth of the picture, and
the seabed depth is also labelled.
The smaller rectangle inside the larger one represents the
echo sounder’s picture. As you move the shift (and range)
settings, this rectangle adjusts to show what you will see
on the echo screen.
A horizontal black arrow points to the value that this win-
dow adjusts: the depth at which the echo sounder picture
starts, relative to the surface of the water.
3. Press the CURSOR PAD up or down to shift the picture,
or use the KEYPAD to enter the digits of the desired
depth. If you type the number on the keypad, wait a
moment for the system to enter the number.
4. Press RETURN to go back to the ECHO screen.
Adjusting shift changes the AUTO and DEPTH key tabs
from green to yellow, since the echo sounder is no longer
in automatic mode.
Setting the picture’s range
The range setting adjusts the overall depth covered by the
echo sounder picture, from the top of its display to the bottom.
The range can be set automatically (by pressing AUTO), or
manually on the SET RANGE window.
To set the range:
1. At the ECHO screen, press DEPTH.
2. Press RANGE.