NorthStar 972, Быстрый старт и справочное руководство

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117
Reference section 7 — Echo sounding
Using the MORE key Reference Manual Revision B
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.
To set the range:
1. Press
Depth
.
2. Press
Range
.
3. Press the cursor pad up or down to adjust the
range, or use the keypad to manually enter
the desired range
(press ENTER when done) .
4. Press
Return
to go back to the Echo
Sounder screen.
Viewing the seabed depth
The seabed depth (the “bottom”) is
displayed numerically in a black box at the
left edge of the
echo
screen.
You can change the size and location of
the depth box:
1. Press
Depth
.
2. To cycle through the size choices, repeatedly
press
Depth box
. To move the box up and
down, press the cursor pad.
3. Press
Return
to go back to the Echo
Sounder screen.
The depth box can also be adjusted by
pressing
More
, then pressing
Data
.
Using the depth marker
You can use the depth marker to accu-
rately measure the depth of an echo. To
display the depth marker — a dashed hori-
zontal line — and move this marker up or
down, press the cursor pad down on the
main echo screen. Small digits attached to
the depth marker line display the marker’s
exact depth.
The depth marker also affects the Marker
Zoom display (see
Marker zoom, on page
111).
Using the MORE key
Pressing the
MORE
key accesses the
following functions:
•
alarms (described beginning on page
131)
•
advance speed
•
A-scope
•
data (numeric and graphic information
on the
Echo Sounder
screen)