Furuno FR-8051 - Manual (Page 21)

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N
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T
H
U
P
Presentation mode,
representative display
Description
Target pips are painted at their measured distances
and in their true (compass) directions with reference to
own ship, north being maintained at the top of the
screen. The heading marker moves according to ship's
heading.
If the gyro fails, the presentation mode changes to
the Head-up mode and the north mark disappears.
Also, the HDG readout at the screen top shows xxx.x.
Own ship and other moving objects move in accordance
with their true courses and speeds. All fixed targets,
such as landmasses, appear as stationary echoes.
When own ship reaches a point corresponding to 75% of
the radius of the radar display, the sweep origin
is automatically flipped (reset) to 50% radius opposite
to the extension of the heading marker passing
through the display center.
Sweep origin may also be reset automatically, in which
case the sweep origin is automatically reset to 50%
radius opposite on the extension of the heading marker
passing through the display center.
If the gyrocompass fails, the presentation mode is
changed to the Head-up mode and the north marker
disappears. Also, the HDG readout at the screen top
shows xxx.x.
T
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U
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M
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N
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marker
North
marker
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(a) True motion
is selected (b) Own ship has reached a
point 75% of display radius (c) Own ship is automatically
reset to 50% of radius
Automatic resetting of sweep center in true motion mode