NorthStar Navigation Echo Sounder NorthStar 491 - Manual (Page 40)

Page 36 491 Echo Sounder Operations Manual
Viewing the seabed depth
The seabed depth (the “bottom”) is displayed in a black box at
the left edge of the ECHO screen.
You can change the size and location of the depth box on the
ECHO screen. Its size on the SOUNDTRAC screen is always
small.
There are four available sizes:
• small
• medium
• large
• huge
To resize the depth box or move it up or down:
1. At the ECHO screen, press DEPTH.
2. To cycle through the size choices, repeatedly press
BOTTOM BOX. To move the box up and down, press the
CURSOR PAD.
3. Press RETURN to go back to the ECHO screen.
The depth box can also be adjusted by pressing MORE, then
pressing DATA.
Viewing the depth marker
You can use the depth marker to accurately measure the depth
of an echo. To display the depth marker—a dashed horizontal
line—and move this marker up or down, press the CURSOR
PAD down. Attached to the depth marker line is a small black
box, which displays the marker’s exact depth.
The depth marker also affects the display in Marker Zoom
mode.
Changing the depth settings
You can adjust the shallowest and deepest echoes to be shown
on the ECHO screen. In automatic mode, the echo sounder
sets these values based on its current environment. However,