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Furuno FR1510 MARK-3 Manual

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-1.19-
(a) Select location with cursor (b) Press SHIFT key to offcenter
Note: The display is automatically reset to 75% of the range in use whenever the cursor is placed
at an edge of the effective display area. Note also that the heading marker (small circle on the
bearing scale) leaves the heading line on off-centered display, always indicating the correct
direction of the own ship heading.
1.24 Echo Averaging
The echo average feature effectively suppresses sea clutter. Echoes received from stable targets
such as ships appear on the screen at almost the same position every rotation of the scanner. On
the other hand, unstable echoes such as sea clutter appear at random positions.
To distinguish real target echoes from sea clutter, echo average performs scan-to-scan correlation.
Correlation is made by storing and averaging echo signals over successive picture frames. If an
echo is solid and stable, it is presented in its normal intensity. Sea clutter is averaged over
successive scans resulting in the reduced brilliance, making it easier to discriminate real targets
from sea clutter.
To properly use the echo average function, it is recommended to first suppress sea clutter with the
A/C SEA control and then do the following:
1. Press the [F1] key.
2. Press the [5] key twice to select ECHO AVG.
ECHO AVG
1. VECTOR T/R
2. PULSE
3. INT REJ
4. STRETCH
5. ECHO AVG
6. CONTRAST
7. N REJ
8. DISP SEL
9. PM
0. SART
3. Press the [5] key to select echo averaging level desired from the ECHO AVG field.
OFF: No averaging effect
0.5: Distinguishes small targets from sea clutter.
1: Helps distinguish targets from sea clutter and suppresses brilliance of unstable echoes.
2: Distinguishes small stationary targets such as navigation buoys.
3: Stably displays distant targets.
CURSOR
+
CURSOR
+
… 33 …


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