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3-16
m
150
History for last 5 minutes
Echogram of beam 3 (port)
Echogram of beam 1 (fore)
Echogram of beam 2 (starboard)
Depth mark of layer 1
Depth mark of layer 2
Depth mark of layer 3
Bottom echo
Depth range
Range selectable at
RANGE menu
Cursor for manual bottom
acquisition (See procedure
below.)
Depth
Bottom echo
Echo strength
Transmission pulse
Echo strength
(Layers 1, 2 and 3)
ECHO LEVEL SECTION
ECHO LEVEL Display
Display mode
selectable in MENU 1
Two presentation modes are available for echo level display.
` The “COLOR” mode provides narrow echograms for three directions, presenting echo strengths
in color gradation. (Color sounder mode)
` The “GRAPH” mode presents echo strengths of three beams with amplitude varying with depth.
(A-scope mode)
COLOR GRADATION mode
(Echo history for 5 minutes)
AMPLITUDE GRAPH mode
(Realtime A-scope)
` When bottom echo is lost for a short while due to air bubbles, or the equipment tends to track on
false bottom, try to acquire it manually.
1. Set “REF DEPTH” to OFF in MENU 2.
2. Select ground tracking mode by the
TRACK
MODE
key.
3. Press the
MANUAL
TRACK
key for more than 1 second. LED indicator aside the key lights and the
manual tracking cursor appears in the echo level display.
4. Turn
knob to place the cursor on the bottom echo.
5. When bottom echo is acquired, press the
MANUAL
TRACK
key to return to the automatic ground
tracking mode. (Do not leave the equipment in the manual tracking mode.)
Bottom echo
Manual tracking cursor