Selecting The Presentation Mode; Erasing The Heading Marker, North Marker; Magnifying Long Range Echoes (Echo Stretch) - Furuno FR-7062 Operator's Manual

2.11 Selecting the Presentation
Mode
This radar provides four presentation modes:
head-up, course-up, north-up and true motion.
Press the [MODE] key.
With heading sensor connection, the display and
the display mode indication at the top left-hand
corner of the display change in the sequence of
HU RM (Head-up), CU RM (Course-up), NU
RM (North-up) and NU TM (True Motion)
when the [MODE] key is pressed. If there is no
heading sensor connection, the display mode is
always HU RM.
Note: The radar begins operation with last
selected display mode (except Course-
up) whenever the unit is turned on.
Note however that Head-up is selected
when Course-up was the last-used
mode.
Head-up
The picture is oriented so the heading marker
is at the top of the display. This mode is useful
for navigation in congested waters.
Course-up
The Course-up mode shows ship's heading by
the heading marker, at the top of the display. To
get heading desired, steer vessel in direction de-
sired, and then show "CU RM" at the top left-
hand corner of the display.
North-up
North is at the top of the display and the head-
ing marker moves with ship's heading. This
mode is useful for determining ship's position
and as a navigation monitor on a nautical chart.
The picture is stabilized against yaw of vessel,
thereby reducing smear of target echoes. Bear-
ing signal is required from a heading sensor.
True motion
True motion displays own ship and moving
objects in their true motion. Bearing signal and
speed signal are required from heading sensor
and speed sensor.
2.12 Erasing the Heading Marker,
North Marker
The heading marker or north marker (available
with gyrocompass connection) may occasion-
2-6
ally mask a target. To view the target, you can
temporarily erase the heading marker and north
marker by pressing and holding down the
[GAIN (HM OFF)] control. Release the con-
trol to re-display the markers.
Figure 2-6 Heading marker and north marker
2.13 Magnifying Long Range
Echoes (echo stretch)
Normally, the reflected echoes from long range
targets appear on the display as weaker and
smaller blips even though they are compensated
by the radar's internal circuitry. The echo stretch
function magnifies these small blips in all
ranges. Two types of echo stretch are available:
ES1 which stretches echoes in bearing direc-
tion and ES2 which stretches them in both range
and bearing directions.
To turn the echo stretch on or off, press the
[A/C RAIN (ES)] control. Each press changes
the echo stretch function in the sequence of
ES1, ES2 and OFF. ES1 or ES2 appears at
the top right-hand corner of display when
echo stretch is on.
Bearing
direction
Echo stretch 1
Figure 2-7 Echo stretch
Note1:This function magnifies not only targets
but also sea clutter and radar
interference. For this reason be sure the
controls for adjustment of sea clutter
and radar interference are properly
adjusted before activating the echo
stretch.
Note 2: ES2 is not available on short ranges.
Heading
marker
North marker
Bearing
direction
Range
direction
Echo stretch 2