Furuno 1942 MARK-2 - Manual (Page 22)

3-2
North up
North is at the top of the display and the head-
ing marker moves with ship’ s heading. This
mode is useful for determining ship’ s posi-
tion and as a navigation monitor on a nauti-
cal chart. The picture is stabilized against yaw
of vessel, thereby reducing smear of target
echoes.
True motion
True motion displays own ship and moving
objects in their true motion.
3.3 Magnifying Long Range
Echoes (echo stretch)
Normally, the reflected echoes from long
range targets appear on the display as
weaker and smaller blips even though they
are compensated by the radar’s internal cir-
cuitry. The echo stretch function magnifies
these small blips in all ranges. Two types of
echo stretch are available: ES1 which
stretches echoes in bearing direction and
ES2 which stretches them in both range and
bearing directions.
To turn the echo stretch on or off;
1. Press the [MENU] key to open the menu.
2. Select “ES.”
3. Each press of the [ACQ/ENTER] key
changes the echo stretch function status
in the sequence of ES1, ES2 and OFF .
ES1 or ES2 appears at the top right-hand
corner of the display when echo stretch
is on.
Bearing
direction
Bearing
direction
Range
direction
Echo stretch 1 Echo stretch 2
Figure 3-3 Echo stretch
Note1: This function magnifies not only tar-
gets but also sea clutter and radar interfer-
ence. For this reason be sure the sea clutter
and radar interference are suf ficiently sup-
pressed before activating the echo stretch.
Note2: ES2 is not available on short range.
3.4 Echo Trail
You can show the movement of all radar tar-
gets relative to your vessel in afterglow. This
function is useful for alerting you to possible
collision situations.
Starting echo trail
1. Press the [MENU] key to open the menu.
2. Select “ECHO TRAIL” by the omnipad.
3. Select “ACTIVATE” by pressing the [ACQ/
ENTER] key.
Figure 3-4 How the echo trail feature works
TRAIL, the echo trail time selected (on
“OTHERS MENU”) and elapsed time appear
at the top right-hand corner of the display .
Then, afterglow starts extending from all tar-
gets.
Note:
Trails are restarted when range or
mode is changed or zoom or of fcenter is
turned on.