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1.23 Echo Stretch
On long ranges target echoes tend to shrink
in the range direction, making them difficult
to see. On short and medium ranges such
as 1.5, 3 and 6 nm range scales, the same
sized targets get smaller on screen as they
approach own ship. To enhance target
video, use the echo stretch feature.
Echo
stretched
in range
direction
Echo
Echo stretch OFF Echo stretch ON
ES
Echo stretch
ON
Figure 1-21 Echo stretch
1. Press the [MENU] key to open the
menu.
2. Select ECHO STRETCH.
3. Select ON or OFF as appropriate.
4. Press the [MENU] key to register your
selection and close the menu.
ES appears at the top right-hand corner on
the screen when the echo stretch feature is
on.
Note 1:
Echo stretch magnifies not only
small target pips but also returns
from sea surface, rain and radar
interference. For this reason, make
sure that these types of inter-
ference have been sufficiently
suppressed before activating the
echo stretch.
Note 2:
Echo stretch is not available on the
ranges between 0.125 and 0.75
nautical miles. The indication ES is
highlighted on those ranges to
show that echo stretch is
inoperative.
1.24 Navigation Data
With navigation data input in NMEA 0183
format (IEC 61162-1), navigation data can
be displayed at the screen bottom.
Navigation data includes position, course,
speed, and range and bearing to destination
waypoint (if set on navaid). A waypoint is
shown on the remote display by a dashed
ring connected to the screen center (own
position) by a dashed line.
6.0
NM
2.0
WP
LL
17.0°
M
2.6
NM
34° 38.99
N
135° 19.22
E
CSE
18.0°
M
*
SPD
4 .
3
KT
Course
EBL
VRM
45.0°
2.42
NM
255.0°
3.35
NM
Speed
Bearing and range to waypoint
*- Bearing suffixed with M
(Magnetic bearing) or T (True bearing).
Own ship position
Waypoint
mark
*
Figure 1-22 Sample navigation data display
Note 1:
External sensor must be capable of
outputting data to show it on the
remote display.
Note 2:
A location is blank when there is no
corresponding data.
Note 3:
To receive data from multiple
equipment, all data must be
combined into one data line by a
data-mixing device.
Note 4:
Magnetic and true bearings may be
selected alternately by pressing
and holding down the [GAIN] key.
Turning on the navigation data display
1. Press the [MENU] key to open the
menu.
2. Select NAV DATA.
3. Select ON.
4. Press the [MENU] key to finish.