
CVR–010
Basic Operating Instructions
(continued on next page)
15
7.1. Interpreting Navigation Sounder Screen
(continued – 2/5)
①
Bottom Echo
・
The bottom echo is shown in up to a total of seven different colors, depending on the
strength.
・
The colors used to display the echoes are shown on the color scale (
②
) in order of
strength.
・
Red, initially at the lower end of the scale, represents the strongest part of the echo (i.e.
hardest layer of bottom stratum)
, and blue initially represents the weakest part (i.e. softest
layer of the bottom)
.
・
It is possible to display only the contour of the bottom in a single color via the
menu–guided procedure. See paragraph 8.9 for instructions.
②
Color
Scale
・
When the echo display
*
1
is set to show echoes in full colors, the colors used to display
various echo strength levels are listed here in order of relative strength.
・
The color that represents the strongest level is initially red, and the one that represents
the weakest level is initially blue.
・
The intervening colors simulate various mid strength levels. See paragraph 8.10.2
for
related information.
・
An echo must be initially 3 decibels (dB) stronger or weaker than the adjacent strength
level before it can be displayed in next stronger or weaker color. See paragraph 8.10.4
for greater details.
*
1
:
Paragraph 8.9
,
MAIN MENU
→
8:ECHO DISPLAY
→
2:NORMAL DISPLAY
Figure 7-2 Initial Assignments of Echo Colors
③
Depth
Readout
(1/2)
・
The depth to the bottom from the selected reference (
⑤
) is indicated here.
-
Readout
Unit:
m
= meters (initial setting),
FM
= fathoms,
FT
= feet
- Refer to paragraph 8.10.3
for details.
< C A U T I O N >
To comply with IMO resolution MSC.74(69), measurements must be made in
meters for navigational purposes
.
・
To obtain a continuous readout, the bottom echo (
①
) must be displayed in red, orange
or yellow ( or three user–defined strongest echo colors). This is automatically
accomplished when you are operating the unit in the fully automatic control mode
(
AUTO
,
④
).
Strength Level 1 (weakest echo)
Strength Level 2
Strength Level 3
Strength Level 4
Strength Level 5
Strength Level 6
Strength Level 7 (strongest echo)
Blue
Light Blue
Yellowish Green
Green
Yellow
Orange
Red
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