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Type in the numeric value 1, 2 and
press([.
In our example the
correction was a plus value. So, even though the
”
+/-I’
prompt just came
on-screen, just press
thdmlkey
again for the +1.2us TD 1 correction.
Whedwiis
pressed, the display
is now ready to continue with entering
the offset value for TD2. Type in the numeric value 0,2.
Press.
This
time press the +/, softkey, since the correction was a minus value. Then press
IENTER]to
store the -0.2~s TD2 value.
Manual L/L Corrections
Instead of using the Auto ASF program or the manual TD offset values, the
L/L coordinates may be corrected manually. The process is similar to making
manual TD correction entries, and is accomplished in the following manner:
First go to a fixed navigation point and read your current L/L position from
the loran display. Extract the L/L coordinates of the fixed point from your
marine chart. Subtract the two Latitudes and the two Longitudes from each
other to determine the appropriate correction to be entered into the NAV
unit.
Example: N42 42.23’ Loran
W071 24.54’ Loran
N42 42.08’ Chart
WO7124.50’
Chart
-
.
15’
(South) -.04’ (East)
After you have calculated your correction, select the POSITION CORR.
menu. Press the
@
softkey to highlight AL/L .
Type in the value of Latitude Offset 1, 2, 6. Press
the-1
key.
“N/S”
appears at the center softkey position. Since our sample offset is to the South,
press
them
softkey to change the direction for the latitude correction to
“S”.Then
press-l.
Whenle[is
pressed, the display will expect you to enter the value of
the Longitude Offset with the numeric keys. Type in 1,
0,5.
Press
-1
and the “E/W” characters appear again at the center
softkey
position. This
time the correction is to be subtracted. Use
key to select E (-) for
the longitude correction before pressing
/E
Press
thd=lkey
to return back to the Main Menu Directory. You could
presslCLEARlone more time to go back to the display mode. However, this
time press
the-1
softkey again
so we cm
check the AVERAGING
menu for Loran.