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Appendix B Acronyms
BBR Battery Backed-up RAM
CLT Carrier Lock Time
CN0 Carrier to Noise Ratio
COG Course Over Ground
CTM Continuous Tracking Mode
DGPS Differential GPS
DOP Dilution of Precision
DR Dead Reckoning
ECEF Earth-Centered Earth-Fixed
EDOP Easting Dilution of Precision
EGNOS the European Geostationary Navigation Overlay Service
EKF Extended Kalman filter
GDOP Geometric Dilution of Precision
GNSS Global Navigation Satellite System
HDOP Horizontal Dilution of Precision
HOW Hand-Over Word
LNA Low Noise Amplifier
MSAS MTSAT-Based Augmentation System
NDOP Northing Dilution of Precision
NMEA the National Marine Electronics Association
PDOP Positional Dilution of Precision
PRN Pseudorandom Noise
PVT Position Velocity Time
RINEX Receiver Independent Exchange Format
RTC Real Time Clock
RTCM the Radio Technical Commission for Maritime Services
SBAS Satellite Based Augmentation Systems
SNR Signal-to-Noise Ratio
SOG Speed Over Ground
SPS Standard Positioning Service
TDOP Time Dilution of Precision
TOW Time of Week
TTFF Time To First Fix
VDOP Vertical Dilution of Precision
UTM Universal Transverse Mercator
WAAS Wide Area Augmentation System