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1.28 Watch Alarm
The watch alarm works like an alarm clock,
sounding an aural alarm and blinking a visual
indication "T ALM" at the predetermined time
interval. When the alarm sounds, you can silence
it by pressing the AUDIO OFF key.
You can select time interval (3 min, 6 min, 12
min, 15 min, or 20 min) on the TIME ALM menu.
1) Press the MENU key.
2) Select the TIME ALM menu.
3) Press the ENTER/SELECT key.
4) Select TIME ALM and press the ENTER/SE-
LECT key.
5) Select time interval (or OFF).
6) Press the ENTER/SELECT key.
7) Press the MENU key.
1.29 Echo Average
The echo average feature effectively suppresses
sea clutter and other random noise. Echoes re-
ceived from stable targets such as ships (if not
moving at high speeds) appear on the screen at
almost the same position every rotation of the
antenna. On the other hand, unstable echoes such
as sea clutter appear at random positions.
To distinguish real target echoes from sea clutter,
this radar performs scan-to-scan correlation. Cor-
relation is made by storing and averaging echo
signals over successive picture frames. If an echo
is solid and stable, it is shown in its normal in-
tensity. Sea clutter is averaged over successive
scans and reduced in brightness. This makes it
easier to discriminate real targets from sea clut-
ter.
How to turn on echo averaging
To properly use the echo average feature, first
properly suppress sea clutter with the A/C SEA
control and then select echo average function as
follows;
1) Press the MENU key.
2) Select the ECHO SIG menu.
3) Press the ENTER/SELECT key.
4) Select ECHO AVG and press the ENTER/SE-
LECT key.
5) Select 1, 2, or 3.
1: Distinguishes targets from sea clutter and
suppresses brilliance of unstable echoes.
2: Distinguishes small stationary targets such
as navigation buoys.
3: Displays distant targets as stable echoes.
6) Press the ENTER/SELECT key.
7) Press the MENU key.
a) Echo average OFF
Figure 1-25 Echo average
CAUTION
Do not use the Echo Average feature under
heavy pitching or rolling; loss of true
targets can result.
b) Echo average 1
1 – 23
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