5. OPERATION
5-8
Note 2: All modes except head-up require a heading signal in AD-10 format or NMEA
format. If the heading signal is lost, the mode is changed to head-up and the north
marker disappears. The display for heading is XXX.X and the alarm sounds. The mes-
sage "GYRO" (AD-10 format data) or "NMEA_HDG" (NMEA format data) appears in
the alarm message display. To stop the audio alarm, press any key. When the heading
signal is restored, check the heading. The numeric value is displayed at the heading
indication when the heading signal is restored.
5.7.2 Description of display modes
Head-up mode
A display without azimuth stabilization in
which the line that connects the center with
the top of the display indicates your heading.
Targets are shown at their measured dis-
tances and their directions relative to your
heading. The short dotted line on the bearing
scale is the north marker.
Course-up mode
The radar picture is stabilized and displayed
with the currently selected course at the top
of the screen. When you change the head-
ing, the heading line moves with the course
selected. If you select a new course, select
the course-up mode again to display the new
course at the top of the display.
Targets are shown at their measured dis-
tances and their directions relative to the set
course, which is at the 0-degree position.
The heading line moves according to the yawing and any course change.
North-up mode
Targets are shown at their measured dis-
tances and their true (compass) directions
from your ship. North is at the top of the
screen. The heading line changes its direc-
tion according to your heading.
Heading line
North marker
Heading line
North marker
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