NorthStar 961 Reference Manual page 290

Chapter 13 - Customizing Setup Functions
Reference ellipsoids
International (INTL)
Krassovsky (KRASS)
South American 1969 (SA1969)
WGS 60
WGS 66
WGS 72 (WGS-72)
WGS 84 (WGS)
Preferred loran GRI
Advancing
waypoints
Page 13-20
Table 11: Reference ellipsoid constants (continued)
* In Namibia, "a" = 6377483.865 legal meters, reflecting a
difference there in the definition of legal and International
meters.
You can choose the preferred four-digit loran GRI to use when
converting lat/lon coordinates to Phantom loran TDs. If
possible, this preferred GRI will be used. Otherwise, the GRI
that gives the best accuracy will be used.
To change the preferred loran GRI:
1. At the NAVIGATION SETUP screen, press the CURSOR
PAD to highlight the LORAN GRI option, then press the
EDIT key.
2. Press the CURSOR PAD up or down or press the LEFT
ARROW or RIGHT ARROW keys to scroll the list of
available GRIs.
3. When done, press the SELECT key (or CANCEL to leave
the option unchanged).
4. Press RETURN to go back to the SETUP MENU screen.
As you pass each waypoint, you can either manually switch to
the next waypoint or automatically advance to the next one.
Passing a waypoint means that your vessel has come abeam of
the waypoint.
a (meters)
6378388
6378245
6378160
6378165
6378145
6378135
6378137
961/962 Operations and Reference Manual, Rev. A
f (flattening)
1/297
1/298.3
1/298.25
1/298.3
1/298.25
1/298.26
1/298.257223563