Furuno FR-1710 - Manual (Page 40)

1-26
1.29 Zoom
The zoom function is useful for enlarging an
area of interest as large as twice the normal
viewing. This performs the range scale re-
duction to a half and the offset at the same
time. Zoom can be used on ranges other than
0.125, 72, 96, 120 nm.
1. Place the cursor (+) close to the point of
interest by operating the trackball.
2. Press the [ZOOM] key. The area around
the cursor and own ship is enlarged twice
as large as the original size.
3. To cancel zoom, press and hold down the
[ZOOM] key about two seconds.
Note: The zoom feature is inoperative when
the display is off centered.
+
(a) Cursor placed at
point of interest
Cursor
(b) Press ZOOM
key to zoom in.
+
Cursor
Figure 1-38 Zoom
1.30 Markers
Heading line
The heading line indicates the ship’s head-
ing in all presentation modes, and is a line
from the own ship position to the outer edge
of the radar display area and appears at zero
degrees on the bearing scale in head-up
mode, it changes the orientation depending
on the ship orientation in the north-up and
true motion modes.
Temporarily erasing heading line, north
marker, stern marker, own ship symbol
To temporarily extinguish the heading line,
north marker, stern marker and own ship sym-
bol to look at a target which may be obscured
by those markers, press the GAIN control (HL
OFF control). The heading line, north marker,
stern marker and own ship symbol reappear
when the control is released. Note that the
RP screen is also temporarily erased when
the RP-17 is connected.
North marker
The north marker appears as a short dashed
line. In the head-up mode, the north marker
moves around the bearing scale in accor-
dance with the compass signal.
Stern marker
The stern marker (a dot-and-dash line) ap-
pears opposite to the heading line. It can be
displayed/erased on the item MARK/LINE in
the OTHER menu.
Own ship symbol
The own ship symbol appears at own ship
position. It can be displayed/erased on the
item MARK/LINE in the OTHER menu. The
symbol is scaled to indicate length and beam
of the vessel. If the largest dimension of the
symbol gets smaller than 6 nm, the symbol
will disappear and own ship will be repre-
sented by a small dot or circle. The size of
the symbol is set at installation.