NorthStar 961, Reference Manual

Page: 175 / 404

Chapter 7 - Creating Avoidance Points
961/962 Operations and Reference Manual, Rev. A Page 7-15
NOTE:
If you erase from the
AVOIDANCE POINTS
screen an avoidance
point that’s still in the future trip, you’ll still see the yellow and red
avoidance-point alarms until you manually clear these alarms at the
ALARMS
screen.
Changing the display of coordinates
When you’re viewing the
AVOIDANCE POINTS
screen, you
can view the position of avoidance points in three different
ways:
• distance and bearing
• lat/lon
• loran time differences (TDs)
Distance and bearing (
DISTANCE/BRG
) is always shown (often
the most useful way, since it may be easier to visualize “three
miles north” than the digits of lat/lon or TDs). These two
columns are completely empty if the 961/962 has no position
fix.
You can switch between lat/lon and TDs by pressing the
TDS,LT/LN
key. When you use TDs, three fields appear on the
screen:
GRI
,
TD#1
, and
TD#2
. GRI defines the particular
geographical group of loran stations, and TD#1 and TD#2
represent the best pair of loran secondary stations. (GRI can be
set to the user’s preferred GRI, as defined at the
NAVIGATION
SETUP
screen; see “Preferred loran GRI” starting on page
13-20.) Not all positions have corresponding TDs. In these
cases, dashes are shown in the
GRI
and
TD
fields.