NorthStar 961X Operation And Reference Manual page 281

Reference ellipsoids
Krassovsky (KRASS)
South American 1969 (SA1969)
WGS 60
WGS 66
WGS 72 (WGS-72)
WGS 84 (WGS)
Preferred loran GRI
Advancing
waypoints
961 Operations and Reference Manual Rev. D
Table 11: Reference ellipsoid constants (continued)
* In Namibia, "a" = 6377483.865 legal meters, reflecting a dif-
ference there in the definition of legal and International
meters.
You can choose the preferred four-digit loran GRI to use when
the 961 converts lat/lon coordinates to Phantom loran TDs. If
possible, the 961 will use this preferred GRI; otherwise, the
961 will use the GRI that gives the best accuracy.
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 avail-
able 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.
You can set the 961 so that as you pass each waypoint, you
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.
Chapter 13 - Customizing Setup Functions
a (meters) f (flattening)
6378245 1/298.3
6378160 1/298.25
6378165 1/298.3
6378145 1/298.25
6378135 1/298.26
6378137 1/298.257223563
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