Using Phantom Loran To Determine Position - NorthStar 961X Operation And 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 961's Phantom loran feature is designed for those 961
users who've previously compiled lists of fishing spots or other
locations as loran TDs, and who are now using the 961 as a
GPS-only navigator. The 961 mathematically converts GPS lat/
lon coordinates to loran TDs—in real time as you navi-
gate—enabling you to display your current position as TDs.
When entering new waypoints, the 961 lets you enter way-
point 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 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 the unit were actually
receiving loran signals. Remember, however, that these calcu-
lated 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 micro-
second; however, larger errors are possible in areas for which
the 961 doesn't contain accurate factory-programmed ASF cor-
rection points.
The 961 gives you 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 961's default set-
ting is ON.
1. Press the STAR key twice to access 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.
961 Operations and Reference Manual Rev. D