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Gourse-Up 
Mode 
[GOURSE 
UPI
By 
pressing 
this switch, the ship's heading line is 
fixed 
pointing 
to the zenith 
of 
the
PPI 
(0'on 
range 
rings). In the same way 
as 
in the 
North-up mode, fixed targets do
not flicker, 
but are 
strabilized even 
if the 
ship 
is 
yawing. 
The bearing of the 
heading
line varies by the same shift of own 
ship's course. 
lf 
the course 
is 
changed, the
heading line can be 
reset 
to the Course-up mode 
by 
pressing 
the switch several
times.
Gancel Ship's 
Heading 
Line 
[HL 
OFF]
The ship's heading line 
(HL) 
that 
presents 
the course of own ship is 
always displayed on the radar
display. 
The heading line 
is canceled while lhis 
switch 
is 
being 
pressed, 
so 
that the targets 
on the
heading lines can be seen 
easily.
CancelAll 
Display 
ltems Except Radar Echo, 
VRM, EBL, HL,
RR, 
and 
Cross 
Gursor Mark 
[+l [DATAOFF] 
' 
' 
r 
' '
All display information such 
ARPA vectors, 
symbols and navigation 
data may be cancelled
temporarily by 
the following operations, except 
Radar 
echo, 
VRMs, 
EBLs, 
HL, and cross cursor 
mark
[+] 
and 
range rings.
@ 
1 
ctick 
mENUlon 
the screen.
The MAIN 
Menu will 
appear.
North
North-uo Mode
Head-up Mode
349