Furuno FAR-2218-BB Operator's Manual page 68

1. OPERATIONAL OVERVIEW
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 heading, 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 distances and their direc-
tions relative to the set course, which is at the 0-de-
gree position. The heading line moves according to
the yawing and any course change.
NORTH UP mode
Targets are shown at their measured distances and
their true (compass) directions from your ship. North is
at the top of the screen. The heading line changes its di-
rection according to your heading.
STAB HEAD UP 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 gyrocompass. If the gyro-
compass fails, the bearing scale returns to the state of HEAD UP mode.
True motion mode
Your ship and other objects in motion move with their true courses and speed. All fixed
targets, like landmasses, appear as fixed echoes in ground stabilized TM. When your
ship reaches a point that is 50% of the radius of the display, the position is reset. The
ship appears at 75% radius opposite to the extension of the current course. You can
manually reset your ship symbol if you highlight the [CU/TM RESET] indication at the
top of the screen, then left-click.
Heading
line
Note: The position of the own ship marker and bearing scale change according to ref-
erence position and off-centering.
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North
marker
(a) True motion (b) Your ship has reached a
is selected point 50% of display radius
Heading line
North marker
North marker
Heading line
(c) Your ship is automatically
reset to 75% of display radius