Furuno FR-1710 - Manual (Page 21)

1-7
Presentation mode,
representative display Description
North-up Mode
In the north-up mode, target pips are painted at their
measured distances and in their true (compass)
directions from own ship, north being maintained
up of the screen. The heading line changes its
direction according to the ship’s heading.
If the compass fails, the presentation mode changes
to head-up and the north marker disappears. Also,
the HDG readout shows xxx.x
°
.
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Heading
line
North
Heading
marker
Course-up Mode
An azimuth stabilized display in which a line connect-
ing 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 top of screen while the
heading line moves in accordance with ship’s yawing
and course changes. This mode is useful to avoid
smearing of picture during course change. After a
course change, press the [SHIFT] key to reset the
picture orientation if you wish to continue using the
course-up mode. The heading line gets back to
perpendicular.
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North
marker
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line
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marker