Furuno 1942 - Manual (Page 24)

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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 com-
pensated by the radar’s internal circuitry. 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 the [ACQ/ENTER] key changes
the echo stretch function 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
Note: This function magnifies not only tar-
gets but also sea clutter and radar interference.
For this reason be sure the controls for ad-
justment of sea clutter and radar interference
are properly adjusted before activating the
echo stretch.
Note: 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
“OTHER 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 shift is turned on.
Fixed time trail
1. When the elapsed time clock counts up to
the trail time selected, the elapsed time dis-
play freezes.
2. The oldest portions of trails are erased so
only the latest trail, equal in length to the
trail time selected, is shown.
3. Trail continues.
For example, the one minute trail time is se-
lected. When the elapsed time clock counts
up to 60 seconds, the elapsed time display
freezes at “60,” but the latest one minute of
trail are erased and then trail continuous.