Furuno FCR-2119-BB, Operation Manual

Page: 82 / 541

2. RADAR, CHART RADAR OPERATION
2-16
2.14.3 Description of presentation modes
Head-up mode
The head-up mode is a display in which the line
connecting own ship and the top of the display in-
dicates own ship's heading.
The target pips are painted at their measured dis-
tances and in their directions relative to own ship's
heading.
The short line on the bearing scale is the north
marker, which indicates heading sensor north. A
failure of all the heading sensor inputs will cause
the heading readout to disappear, and the Alert 450 "Heading Sensor Not Available"
or "Gyro xxx COM1 Error" (a number between 250-259 according to gyro no.) appears
in the [Alert] box.
Course-up mode
The course-up mode is an azimuth stabilized dis-
play in which a line connecting the center with the
top of the display indicates own ship's intended
course (namely, own ship's previous heading just
before this mode has been selected).
Target pips are painted at their measured dis-
tances and in their directions relative to the in-
tended course, which is maintained at the 0-
degree position. The heading line moves in ac-
cordance with ship's yawing and course change. This mode is useful for avoiding
smearing of the picture during course change.
STAB Head-up mode
Radar echoes are shown in the same way as in the head-up mode. The difference
from the normal head-up presentation lies in the orientation of the bearing scale. The
bearing scale is heading sensor stabilized. That is, it rotates in accordance with the
heading sensor signal, enabling you to know own ship's heading at a glance.
This mode is available when the radar is interfaced with a gyro heading sensor. If the
gyro heading sensor fails, the bearing scale returns to the state of head-up mode.
North-up mode
The north-up mode paints target pips at their mea-
sured distances and in their true (heading sensor) di-
rections from own ship, north bearing maintained at
the top of the screen. The heading line changes its di-
rection according to the ship's heading. Requires
heading signal.
If the compass fails, the presentation mode changes
to head-up and the north marker disappears. A failure
of the heading sensor input will cause the heading
readout to disappear, and the Alert 450 (ALF format:
North marker
Heading
line
North marker
Heading
line
North marker
Heading
line