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Figure 1-19 Echo stretch
Turning echo stretch on or off
1) Press the [MENU] key.
2) Select Int/Noise Rej & ES and press the
[ENT] key.
3) Select Echo Stretch.
4) ON or OFF.
5) Press the [ENT] key followed by the
[MENU] key. ES appears at the top right
side on the display when the echo stretch
feature is on.
Note 1: This function magnifies not only tar-
gets but also sea clutter and radar interference.
For this reason be sure the controls for adjust-
ment of sea clutter and radar interference are
properly adjusted before activating the echo
stretch.
Note 2: Echo stretch is inoperative on ranges
from 0.25 to 0.75 nautical miles. ES appears
in reverse video when you try to turn on the
echo stretch in those ranges.
Note 3: When turning on the echo stretch, the
interference( level 3) and noise rejector
rejectiors are automatically turned on to remove
interference and noise. They may be turned
off if there function is not needed.
1.22 Selecting Unit of
Measurement for Range
The unit of measurement for the VRM and
cursor can be nautical miles, kilometers, or
statute miles. You may select unit desired as
follows.
1) Press the [MENU] key.
2) Select Mode & Function and press the
[ENT] key.
3) Select VRM Unit to nm, km, or sm.
4) Press [ENT] followed by [MENU] key.
1.23 Selecting Bearing
Reference
Bearing can be displayed relative to north
(relative bearing) or relative to true north
(true bearing) as follows. (True bearing re-
quires heading sensor input.)
1) Press the [MENU] key.
2) Select Mode & Function and press the
[ENT] key.
3) Select EBL Ref.
4) Select Rel(ative) or True.
5) Press the [ENT] key followed by the
[MENU] key.
1.24 Erasing the Heading
Marker
The heading marker continuously appears
on the display and shows your vessel’s head-
ing. When this mark obscures a target echo,
you can temporarily erase it by pressing and
holding down the [HM OFF] key. Release
the key to redisplay the marker.
Echo stretch OFF Echo stretch ON
Distant
echo