Koden MDP-621 - Page 227

Chapter 10MDP-621/641/640
MENU operation Operation manual
(2) Bottom Det Start
The setting for the bottom
detection level is too large and
the sea bottom is not
detected.
Sets the depth at which to start bottom detection.
Care should be taken, as bottom detection in shallow 
areas may not be possible if this value is too large
(Too deep). The unit cannot detect the sea bottom
in areas that are shallower than the set bottom
detection start depth.
Schools of fish in areas shallower than the preset
depth are never mistakenly detected as the sea
bottom.
Setting range: 0.0〜20.0 (0.1 steps)

(3) Bottom Det Lvl(H),(L)
Bottom Det Lvl(H):  Selects the bottom echo’s detectable level at high frequency. 
Bottom Det Lvl(L):  Selects the bottom echo’s detectable level at low frequency.
Use these adjustment functions when sounding cannot be performed even know the sea bottom
is displayed.
Setting range:  -99 〜 +40(in 1 steps)
COG SOG
35
o
05.020N 135
o
27.611E 359.4
o
17.8 kt
10
0
200
150
100
50
The depth setting for the bottom detection start
function is not displayed on the screen.
1.5
Bottom Det Start
Set the value while
viewing the image.
+0
Bottom Det Lvl (H)

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COG SOG
240
58.5
0
200
150
100
50
35
o
05.020N 135
o
27.611E 359.4
o
17.8 kt
From here on, if the bottom
detection function is set to
start from within the screen
area, the bottom will not be
detected.
If set outside the screen
area, the bottom detection
is effective up to twice the
screen display area.
(4) Bottom Det Range
Sets the bottom detection function to detect the sea
bottom within the screen or outside the screen display.
Setting range:Within display / Outside display

0
Within display
1
Outside display
Bottom Det Range
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10-66 0093161022-06