Furuno 1715 - Manual (Page 18)

1. OPERATION
10
1.17 Noise Rejector
The noise rejector suppresses white noise,
which appears on the screen as many dots
scattered randomly over the display.
1. Press the [MENU/ESC] key to open the
User menu.
2. Press ▲ or ▼ to choose NOISE
REJECTION from page 1.
3. Press ► to open the options window.
4. Press ▲ or ▼ to choose OFF, LOW or
HIGH as appropriate.
5. Press the [MENU/ESC] key to close the
menu.
1.18 Echo Trail, Trail Brilliance
Echo trails are the afterglow of target echoes
that represent their movements relative to
own ship. They are useful for monitoring
target movement.
Trails are painted for the time period chosen.
When the time period has elapsed, trails are
erased and restarted. Trails are also erased
and restarted whenever the range is changed
or zoom or shift is activated.
30S TRAIL Trail time
(No time shown
in case of
continuous trails)
Echo trail
Echo trails
1. Press the [MENU/ESC] key to open the
User menu.
2. Press ▲ or ▼ to choose ECHO TRAIL
from page 2.
3. Press ► to open the options window.
OFF
30sec
1min
3min
6min
CONTIN.
Echo trail options
4. Press ▲ or ▼ to choose appropriate time,
or OFF to cancel echo trails. “CONTIN.”
paints trails continuously.
5. Press ◄ to close the options window.
6. Press ▼ to choose TRAIL BRILLIANCE.
7. Press ► to open the options window.
8. Press ▲ or ▼ to choose LOW or HIGH
as appropriate.
9. Press the [MENU/ESC] key to close the
menu.
“TRAIL” and trail time (no time shown in case
of “CONTIN.”) are shown at the upper
right-hand corner on the screen.
1.19 Echo Stretch
On long ranges target echoes tend to shrink,
making them difficult to see. To enhance
target video on long ranges, use the echo
stretch feature.
1. Press the [MENU/ESC] key to open the
User menu.
2. Press ▲ or ▼ to choose ECHO
STRETCH from page 1.
3. Press ► to open the options window.
4. Press ▲ or ▼ to choose OFF, LOW or
HIGH as appropriate. LOW stretches
echoes in the bearing direction; HIGH
stretches echoes in the range and bearing
directions. “ES L” or “ES H” appears at
the top right-hand corner when echo
stretch is turned on.
5. Press the [MENU/ESC] key to close the
menu.
Echo
ES L ES H
Brg dir.
Brg dir.
Rng
dir.
Echo Stretch Echo Stretch Echo Stretch
OFF LOW HIGH
How echo stretch works