Table of Contents
Advertisement
ECHO LEVEL
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)
Echogram of beam 3 (port)
Echogram of beam 1 (fore)
Echogram of beam 2 (starboard)
m
150
COLOR GRADATION mode
(Echo history for 5 minutes)
` 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
MANUAL
3. Press the
TRACK
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
tracking mode. (Do not leave the equipment in the manual tracking mode.)
Manual tracking cursor
3-16
Display
Depth mark of layer 1
Depth mark of layer 2
Depth mark of layer 3
Cursor for manual bottom
acquisition (See procedure
below.)
Bottom echo
Depth range
Range selectable at
RANGE menu
TRACK
MODE
key for more than 1 second. LED indicator aside the key lights and the
ECHO LEVEL SECTION
Display mode
selectable in MENU 1
History for last 5 minutes
Echo strength
Depth
AMPLITUDE GRAPH mode
(Realtime A-scope)
key.
MANUAL
key to return to the automatic ground
TRACK
Bottom echo
Transmission pulse
Echo strength
(Layers 1, 2 and 3)
Bottom echo
Advertisement
Table of Contents
