Furuno ETR-30N, Operator'S Manual

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3.2 Additions to NavNet Series Operator’s Manual
Depending on the version number of your NavNet series operator’s manual, its echo
sounder descriptions may not match the screens you see. Please add the following
descriptions to your manual if they are not already present.
Choosing pulse repetition rate (PRR)
Pulse repetition rate can be changed to reduce second reflection echoes. Normally, the
highest rate (20) is used. When in shallow waters, second reflection echoes may appear
between surface and actual bottom echo. In this case lower the pulse repetition rate. If the
setting is too small, it may not be possible to search fish schools effectively. Select “20”
unless second reflection echoes appear on the display. The option “S” means the ship’s
speed dependent mode, where the PRR automatically changes with ship’s speed (requires
speed input).
1. Press the [MENU] key to open the menu.
2. Press the SOUNDER MENU soft key.
3. Select PRR LEVEL.
4. Press the EDIT soft key to open the setting window.
5. Use the trackball or cursor pad
to select pulse repetition rate desired.
6. Press the ENTER soft key followed by the [MENU] key to close the menu.
Sounder system setup menu
Menu items for adjustment of STC and frequencies and selection of fishing objective have
been added to the SOUNDER SYSTEM SETUP menu. Press the [MENU] key, choose
SOUNDER SYSTEM SETUP menu and then press the NEXT PAGE soft key.
SYSTEM
SETUP 2
EDIT
PREV
PAGE
STC - HF 00
STC - LF 00
FREQ. ADJ. - HF +00.0
FREQ. ADJ. - LF +00.0
TARGET ECHO NORMAL
Page 2 of sounder system setup menu
STC-HF, LF
Adjusts STC level for the high and low frequencies, and is useful for suppressing surface
noise. The setting range is 0-10; the higher the setting the greater the degree of
suppression. Setting 10 suppresses noise up to about several meters from own ship. Turn
off the STC when there is no noise on the screen, otherwise weak echoes may be missed.