Using Phantom Loran To Determine Position - NorthStar 961 Reference Manual

Chapter 5 - Understanding Position Coordinates

Using Phantom loran to determine position

What is Phantom
loran?
Selecting Phantom
loran TDs
Page 5-10
The Phantom loran feature is designed for those users who've
previously compiled lists of fishing spots or other locations as
loran TDs. GPS lat/lon coordinates are converted to loran
TDs—in real time as you navigate—enabling you to display
your current position as TDs.
When entering new waypoints, you can enter waypoint
coordinates as loran TDs, usually by first pressing a LL/TDS
key, which switches the display of coordinates between lat/lon
and loran TDs.
The 961/962 may be used to simulate full operation of a loran
receiver. Position coordinates may be displayed as TDs, and all
navigation functions may be used as if you were actually
receiving loran signals. Remember, however, that these
calculated TDs won't exactly match the positions of previously
recorded TD coordinates that you obtained from actual loran
signals. In most areas, TD errors shouldn't exceed one
microsecond on the best pair selected. However, larger errors
are possible in areas for which the 961/962 doesn't contain
accurate factory-programmed ASF correction points.
You have the option to display position coordinates as
Phantom loran TDs. To display TDs on the CHART screen
INFO BARs (and the CURSOR INFO BAR), you must turn on
loran TDs at the CHART SETUP screen. The default setting is
ON.
1. Press the STAR key until you reach the SETUP MENU
screen.
2. Press the CHART SETUP key.
3. Press the CURSOR PAD down to highlight the LORAN
INFO BARS field, then press the EDIT key.
4. Press the CURSOR PAD right to select ON, then press the
ACCEPT key.
5. To display your position in loran TDs, press the CHART
key, then press one of the CHART-screen INFO keys until
you display the loran data.
961/962 Operations and Reference Manual, Rev. A