Type in the numeric value 1, 2 and
In our example the
correction was a plus value. So, even though the
prompt just came
on-screen, just press
again for the
TD 1 correction.
pressed, the display
i s n o w r e a d y t o c o n t i n u e w i t h e n t e r i n g
the offset value for TD2. Type in the numeric value
T
h
i
s
time press the
since the correction was a minus value. Then press
store the
TD2 value.
Manual L/L Corrections
Instead of using the Auto ASF program or the manual TD offset values, the
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
the loran display. Extract the L/L coordinates of the fixed point
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
Chart
.
(South)
(East)
After you have calculated your correction, select the
POSITION CORR
.
menu. Press the
to highlight
.
Type in the value of Latitude Offset 1, 2, 6. Press
key.
appears at the center
position. Since our sample offset is to the South,
press
to change the direction for the latitude correction to
pressed, the display will expect you to enter the value of
the Longitude Offset with the numeric keys. Type in 1,
Press
and the “E/W” characters appear again at the center
position. This
time the correction is to be subtracted. Use
key to select E (-) for
the longitude correction before pressing
Press
to return back to the Main Menu Directory. You could
more time to go back to the display mode. However, this
time press
again
so we cm
check the
AVERAGING
menu for Loran.
