Furuno 1942 MARK-2 Manuel d'utilisateur télécharger pdf (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.

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