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Appendix C: List of Abbreviations C-1
Appendix C:List of Abbreviations
Abbreviation Meaning
BDI Bearing Deviation Indicator
BTW Bearing To Waypoint
CDI Course Deviation Indicator
COG Course Over Ground. The actual direction of your vessel’s movement over the
ground
dGPS Differential Global Positioning System
DR Dead Reckoning
DTG Distance To Go
EGNOS European Geostationary Navigational Overlay System
EMC Electro-Magnetic Compatibility
ETA Estimated Time of Arrival
FAA Federal Aviation Administration
GPS Global Positioning System
HDOP Horizontal Dilution Of Precision. The multiplicative factor that modifies ranging
error. It is caused solely by the geometry between your vessel and your set of
satellites
MOB Man OverBoard
NMEA National Marine Electronics Association (interconnection standard)
MSAS Multi SAtellite System
SA Selective Availability
SDGPS Satellite Differential Global Positioning System
SOG Speed Over Ground. The rate of movement of the vessel over the ground
TTG Time To Go
WAAS Wide Area Augmentation System
WPT Waypoint
XTE Cross Track Error
81167_3.BOOK Page 1 Wednesday, November 21, 2001 2:12 PM