Echo Stretch - Furuno FR-2105 Operator's Manual

1.22 Echo Stretch

On long ranges target echoes tend to shrink in the bearing direction, making them difficult to
see. On short and medium ranges such as 1.5, 3 and 6 nm scales, the same size targets get
smaller on screen as they approach the own ship. These are due to the inherent property of the
radiation pattern of the antenna. To enhance target video, use the echo stretch function. There
are 3 settings: echo stretch 1 (ES1) to enlarge in bearing direction for long range detection,
echo stretch 2 (ES2) to enlarge in range direction and echo stretch 3 (ES3) to enlarge in
bearing and range directions.
To activate the echo stretch:
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.
2. Press the [0] key to display the FUNCTIONS 2 menu.
3. Press the [3] key to select ECHO STRETCH.
4. Press [3] until Echo Stretch option 1, 2, 3 or OFF as desired is highlighted.
5. Press the ENTER key to conclude your selection followed by the RADAR MENU key to
close the FUNCTIONS menu. Selected setting is marked on the left side of the radar
display.
[FUNCTIONS 2]
1 [FUNCTIONS 1]
2 BKGD COLOR BLK(GRN CHAR)/
BLK(RED CHAR)/
BLU (ECHO AREA)
BLU/
BRT BLU
3 ECHO STRETCH OFF/1/2/3
4 ECHO AVERAGE OFF/1/2/3
5 ECHO COLOR YEL/GRN/COLOR*
6 SHIP SPEED LOG//NAV*/MAN
MAN = xx.xKT (STW/SOG)
7 SET, DRIFT OFF/MAN
SET = xxx.x°
DRIFT = xx.xKT
8 INDEX LINES NO. 2 VRM/MAN
MAN = xx.xx NM
9 BRILLIANCE (1)
0 [FUNCTION 3]
*: R-type only
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