GTime               GPS Time (seconds of the day)                              
X                   UTM Easting  Nad83 UTM zone 21N (m)           
Y                   UTM Northing Nad83 UTM zone 21N (m)          
DLat                Latitude  [WGS84] (°N)                                        
DLon                Longitude [WGS84] (°W)                                       
RAlt1a              Raw Primary Radar Altimeter (m)                             
Radar_Alt           Lagged Radar Altimeter (m)                                  
CBaro               Barometric altimeter corrected for drift (m)                
SurfAlt             Ideal Surface altitude
GPSZ0               Uncorrected GPS Altitude (m)                                
DGPSZ               Differentially Corrected GPS Altitude (m)                   
RadarTopo           Digital Topography [DGPSZ - Radar_Alt] (m)                 
radartopo_Final     Levelled Digital Topography [DGPSZ - Radar_Alt] (m)        
demcorr             correction applied to radartopo
MBU                 Uncompensated Lower Tail Mag (nT)                           
MBC                 Compensated Lower Tail Mag (nT)                             
MBc_Lag             Lagged, Compensated Lower Tail Mag (nT)                     
BaseMag1R           Raw Basemag1 (nT)                                           
BaseMag2R           Raw Basemag2 (nT)                                           
BaseMag1            Basemag 1 (nT)                                              
tlcorr              Tieline correction applied
Mag_level           Final tieline levelled mag
IGRF                Calculated IGRF for March 21, 2007 at 300m altitude
Mag_Res             Final tieline levelled mag, IGRF removed
Azimuth             Aircraft Azimuth (°)                                        
Roll                Aircraft Roll [Left wing up is +ve] (°)                     
Pitch               Aircraft Pitch [nose up is +ve] (°)                         
Yaw                 Aircraft Yaw  [ccw crab from line dir is +ve] (°)           
VMl                 Longitudinal Vector Mag (nT)                                
VMt                 Transverse Vector Mag (nT)                                  
VMv                 Vertical Vector Mag (nT)                                    
MLU                 Uncompensated Left Wing Mag (nT)                            
MLC                 Compensated Left Wing Mag (nT)
MLC_Lag             Lagged, Compensated Left Wing Mag (nT)                              
MRU                 Uncompensated right Wing Mag (nT)                           
MRC                 Compensated Right Wing Mag (nT)       
MRC_Lag             Lagged, Compensated Right Wing Mag (nT)                      
GXU                 Raw Lateral Gradient (nT)                                   
GXC                 Compensated Lateral Gradient (nT) 
GXC_Lag             Lagged, Compensated Lateral Gradient (nT)                          
GXR                 Attitude corrected lateral gradient nT/m                    
GX_Level            Final, Levelled Lateral Gradient (nT/m)
GX_Final            Final, Levelled Filtered Lateral Gradient (nT/m)                    
GYU                 Raw Vertical Gradient (nT)                                  
GYC                 Compensated Longitudinal Gradient (nT) 
GYC_Lag             Lagged, Compensated Longitudinal Gradient (nT)                     
GYR                 Attitude corrected longitudinal gradient nT/m               
GY_level            Final, Levelled Longitudinal Gradient (nT/m)               
GY_Final            Final, Levelled Filtered Longitudinal Gradient (nT/m)               
ge                  East Gradient (+ve East ) (nT/m)                            
gn                  North Gradient (+ve North ) (nT/m)                          
Date                Date flown in GSC format (ddmmyyyy)