This file documents the text GRID prints to stdout when processing.  A typical
single-bank display appears as follows:

――――――――――――― GRID: General Radionavigation Interfusion Device ――――――――――――
         RRT:      0 weeks    222.2 seconds   Build ID:   4917
         ORT:   1490 weeks 146234.0 seconds   
―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
CH  TXID    Doppler        BCP           PR       C/N₀     Az     El    CS 
             (Hz)       (cycles)      (meters)  (dB-Hz)  (deg)  (deg)      
―――――――――――――――――――――――――――― GPS_L1_CA_PRIMARY ――――――――――――――――――――――――――――
 1    5     -3700.2     12948972.2   24923426.7   40.0    41.4    7.3   7  
 2   14     -2283.5     12629722.8   21977305.3   49.3   110.9   41.4   7  
 3   16      3269.5     11395962.4   22297488.0   48.9   191.7   34.2   7  
 4   20      1337.7     11818247.0   22173947.0   49.4   298.4   36.6   7  
 5   22     -3804.2     12976976.9   25178762.7   38.7   164.5    3.9   7  
 6   29      1506.3     11785134.9   24108553.8   44.2    85.7   16.4   7  
 7   30     -2874.0     12758476.0   22460802.6   48.2    49.2   30.5   7  
 8   31      -330.1     12195832.6   20504836.0   54.5   347.7   76.0   7  
 9   32       263.7     12057205.4   21387833.5   52.9   274.0   54.2   7  
10   --   ---------  -------------  -----------   ----   -----   ----   -  
―――――――――――――――――――――――――――― GPS_L2_CL_PRIMARY ――――――――――――――――――――――――――――
 1   29      1173.8      -219300.8   24108560.8   40.3    85.7   16.4   6  
 2   31      -257.3        42503.2   20504848.1   54.4   347.7   76.0   6  
 3   --   ---------  -------------  -----------   ----   -----   ----   -  
―――――――――――――――――――――――――――― Standard Solution ――――――――――――――――――――――――――――
PX:  1101966.84  PY: -4583482.27  PZ:  4282236.05      δtR:     12584.29   
VX:        0.00  VY:        0.00  VZ:        0.00   δtRdot:         8.16   
Hσ:        0.81  Vσ:        1.22  εν:        0.36                          
―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

Abbreviations:           

RRT ------- Raw Receiver Time
ORT ------- Offset Receiver Time
CH -------- Channel
TXID ------ Transmitter Identifier
BCP ------- Beat Carrier Phase
PR -------- Pseudorange
C/N₀ ------ Carrier-to-Noise Ratio
Az -------- Azimuth angle toward transmitter
El -------- Elevation angle toward transmitter
CS -------- Channel status
PX -------- Position X coordinate in ECEF (meters)
PY -------- Position Y coordinate in ECEF (meters)
PZ -------- Position Z coordinate in ECEF (meters)
δtR ------- Offset of ORT with respect to true GPS time, in meters equivalent
VX -------- Velocity X coordinate in ECEF (meters/sec)
VY -------- Velocity Y coordinate in ECEF (meters/sec)
VZ -------- Velocity Z coordinate in ECEF (meters/sec)
δtRdot ---- Offset rate of ORT with respect to true GPS time, in meters/sec
            equivalent
Hσ -------- Horizontal error standard deviation (meters)
Vσ -------- Vertical error standard deviation (meters)
εν -------- Normalized innovation squared.  For a properly-tuned receiver, this
            quantity's mean should be unity.


Channel Status (CS) indicator decorations:

s --- spoofing detected
* --- half cycle phase offset possible
c --- data symbol container complete (symbol wipeoff will be highly accurate)
- --- phase error detected
e --- no ephemeris valid for navigation is yet available 


Transmitter Identifier (TXID) decorations:

? --- Health status unknown
u --- Unhealthy


Channel coloring:

yellow --- steady-state conditions
gray ----- channel's DLL has not yet settled into its steady-state tracking regime