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Section VII
Sensors & Interfaces
7-38 2423sv602
Change 1
NAV indicates the LCS is in the normal navigational mode. The LCS
is navigating with sufficient signals inside an LOA, or the LCS is
navigating outside an LOA after flying there from inside an LOA
provided continuous signal reception has been maintained since
before leaving the LOA.
FAILED indicates that the LCS failed initial self-test or an operational
failure is detected.
NONCERT indicates that the LCS is navigating outside the Loran
Operating Area (LOA) and the navigation computer is not utilizing
LCS for position determination.
SEARCH indicates that the LCS is searching for sufficient stations to
navigate.
INSIDE LOA indicates that the aircraft's present position is inside a
defined LOA. This status will be reported even if no stations are
being received.
OUTSIDE LOA indicates that the aircraft's present position is
outside a defined Loran Operating Area.
The remainder of the lines displayed on the LORAN page show the
Loran C chains (GRIs) in use. Up to three GRIs may be displayed.
The GRIs are always listed in ascending numerical order. A
maximum of two GRIs may be manually selected. A manually
selected GRI is denoted by the (M) displayed immediately after the
GRI. The letters after the GRI indicate which stations are in use. A
hyphen (-) indicates that the station is not being received, the cycle
is not being tracked, or the SNR (signal-to-noise ratio) is
unacceptable. An asterisk (*) indicates the station is being received
but is not being used because the LCS has automatically deselected
the station so that it will not be used for position determination. This
may be caused by the station either being beyond the distance limit
or operating in the BLINK (warning) mode.
Section VII
Sensors & Interfaces
2423sv602 7-39
Change 1
LCS Sensor Deselect
1. Access the LCS Status page by pressing the DATA function key
and then selecting the [LCS] line select key.
2. Press the [DESEL LCS] line select key to deselect the LCS. The
status line will indicate NAV (D).
LCS Sensor Reselect
1. Access the LCS Status page by pressing the DATA function key
and then selecting the [LCS] line select key.
2. Press the [SELECT] line select key to reselect the LCS. The
status line will indicate NAV, FAILED, NONCERT, or SEARCH.
GRI (Loran C Chain) Selection
The Loran C chains used by the UNC LCS are listed on the LCS
Status page by their four-digit GRI (Group Repetition Interval). The
Loran C chains and associated GRIs are as follows:
Available
Loran C Chain GRI Stations
Northwest Pacific 9970 M-WXYZ
Korea 5970 M-WX-Z
North Pacific 9990 M--XYZ
Gulf of Alaska 7960 M--XYZ
Canadian West Coast 5990 M--XYZ
U.S. West Coast 9940 M-WXYNorth
Central U.S. 8290 M-WXYSouth
Central U.S. 9610 MVWXYZ
Great Lakes 8970 M-WXYZ
South East U.S. 7980 M-WXYZ
North East U.S. 9960 M-WXYZ
Canadian East Coast 5930 M--XYZ
*Labrador Sea 7930 M-WX--
North Atlantic 9980 M-WX-Z
*Norwegian Sea 7970 M-WXYZ
French 8940 M--X--
Mediterranean 7990 M--XYZ
Northern Saudi 8990 MVWXYZ
Southern Saudi 7170 M-WXYZ
* - No longer commissioned.
Section VII
Sensors & Interfaces
7-40 2423sv602
Change 1
Manual GRI Selection
1. Access the LCS Status page by pressing the DATA function key
and then selecting the [LCS] line select key.
2. Use the line select keys to position the cursor over one of the
three GRI entry fields.
3. Enter the four-digit GRI for the desired chain. When the GRI is
entered, an (M) will be displayed after the GRI to indicate a
manual GRI selection.
Return To Automatic GRI Selection
1. Access the LCS Status page by pressing the DATA function key
and then selecting the [LCS] line select key.
2. Use the appropriate line select key to position the cursor over
the manual GRI entry field.
3. Press the BACK and then ENTER keys to delete the manual
input.
UNC LCS Loran C Operating Areas
Loran-C sensor (P/N 1040) software contains a "map" of the LOA
within which it is programmed to navigate. The version number of
the LOA in the LCS Address page. The LCS Address page is
accessed by pressing the NEXT or PREV keys while on the LCS
Status page. If starting a trip outside the LOA, the LCS will enter the
NONCERT mode only. Position will be displayed but not used by
the system for navigation. Upon entry into an LOA, navigation will
begin automatically.
A mix of actual flight results and employment of known conservative
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