NorthStar 6000i, Quickstart Manual And Reference Manual

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49
Reference section 2 — Position coordinates
Using Phantom Loran Reference Manual Revision D
Returning to GPS navigation
To return to using GPS signals for naviga-
tion, repeat the steps shown for selecting
loran in Selecting and displaying loran, on
page 47, but choose GPS instead of loran.
Using Phantom Loran
If you have lists of fishing spots and other
waypoints that you recorded as loran time
differences (TDs), but you no longer have a
loran receiver, the
6000i can automatically
convert its GPS coordinates into TDs—in
real time, as you travel. You can display
your current position as TDs or navigate to
waypoints using TDs. The accuracy from
this conversion is generally 500 to 1500
feet.
This feature, called Phantom Loran, can
help your transition from loran to GPS. You
can use the
6000i to simulate the full oper-
ation of a loran receiver, using all of the
6000i ’s navigation functions as if it were
actually receiving loran signals.
These calculated TDs won’t exactly match
the positions of previously recorded TDs
obtained directly from actual loran signals.
In most areas, TD errors shouldn’t exceed
one microsecond. However, larger errors
are possible in areas with poor station
geometry, or for which the
6000i doesn’t
have accurate, factory-programmed ASF
correction points.
Selecting Phantom Loran
To display position coordinates as
Phantom Loran TDs:
1. Press the
STAR
key to display the
OPTIONS/SERVICE INFO
screen.
2. Press Navigation Options , then high-
light the NAVIGATION SOURCE option.
3. Press Edit , then press the cursor pad to
select PHANTOM LRN.
4. Press ENTER , then press Return .
5. Press POSITION to display the
LORAN
POSITION
screen.
Setting the Phantom Loran GRI
Press
Set GRI
to change the GRI to be
used in calculating the displayed TDs.
Press the cursor pad to display the avail-
able GRIs one at a time. When the GRI is
correct, press
ENTER
.