Furuno FCR-2107 series, Operator'S Manual

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2. Radar Operation
2-6
2.4.2 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 indicates own ship’s
heading.
The target pips are painted at their measured distances 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 the
heading sensor input will cause the heading readout to disappear, and the message "No heading available" or "Gyro
error" (message in red) appears at the lower right corner of the screen.
Heading Line
North Marker
When the display is off centered
the heading line appears at 0 degree.
Head-up mode
Course-up mode
The course-up mode is an azimuth stabilized display 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 distances and in their directions relative to the intended course, which is
maintained at the 0-degree position. The heading line moves in accordance with ship’s yawing and course change.
This mode is useful for avoiding smearing of picture during course change.
Course-up mode
Head-up TB (True Bearing) mode
Radar echoes are shown in the same way as in the head-up mode. The difference from 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.