Bedienungsanleitung Furuno 1761MK3 (Seite 17 von 33) (Englisch)

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2-6

2. Position the EBL so it bisects the target

by operating the trackball.

3. Press the [EBL] key again to fix the EBL

to the position.

4. Check the bearing readout to find the

bearing of the target. To erase the EBL,

press and hold down the [EBL] key for

about three seconds.

6.0 NM

2.0

EBL1 bearing

R: Relative Bearing

T: True Bearing*

40.0° R

EBL

Target

Cursor

Cursor Bearing

R: Relative Bearing

T: True Bearing*

41.5°R

4.0 NM

MAG115.0°

MAG (or GYRO) BEARING*

*: Heading sensor

(or gyrocompass)

connection required

Figure 2-6 Measuring Bearing by the EBL

and Cursor

The bearing measured by the cursor or the

EBL can be displayed in relative or true bear-

ings (heading sensor or gyrocompass con-

nection required). Relative bearings are

relative to the bow of the vessel, and true

bearings are relative to the True North. The

indication “MAG” (or GYRO”) and the head-

ing sensor (or gyrocompass) bearing (your

ship’s bearing) appear at the top of the

screen.

Note that the bearing to the cursor always

varies with trackball operation. The EBL and

its indication, however, are automatically fixed

when the [EBL] key is pressed or 10 seconds

elapses without trackball operation.

Tips on measuring bearing

• Bearing measurements of smaller targets

pips are more accurate; the center of

larger target pips is not as easily identi-

fied.

• Bearings of stationary or slower moving

targets are more accurate than bearings

of faster moving targets.

• To minimize bearing errors keep echoes

in the outer half of the picture by chang-

ing the range scale; angular difference

becomes difficult to resolve as a target

approaches the center of the display.

2.17 Shifting and Zooming the

Display

The [SHIFT/ZOOM] key has two functions:

display shifting and display zoom. Each time

the key is pressed the function changes in

the following sequence.

Normal

Shift Zoom

Figure 2-7 SHIFT/ZOOM key sequence

Shift

The own ship’s position can be shifted to any

position within the current range. The primary

advantage of the shifted display is that for

any range setting, the view ahead of your own

ship can be extended without changing the

range.

Place the cursor on area you wish to shift to

the screen center and then press the [SHIFT/

ZOOM] key. The indication “SHIFT” appears.

To restore normal operation press the key

twice.

Note: If the cursor is not within the current

range when the key is pressed, an audible

beep sounds and the outermost range ring

blinks twice , even if the range rings are

off.

Zoom

The zoom feature allows you to double the

area between own ship and an arbitrary lo-

cation, to take a closer look at an area of in-

terest without changing the range.

1. Operate the trackball to place the cursor

on the target you want or area you want

to zoom.

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