DTW	Distance to Waypoint
EBL	Electronic Bearing Line
VRM	Variable Range Marker
ECS	Electronic Chart System
ECDIS	Electronic Chart Display and Information System
ENC	Electronic Navigational Charts
EP	Estimated Position
EPFS	Electronic Position Fixing System
ER	Echo Reference
ERBL	Electronic Range and Bearing Line
ETB	Estimated Time of Berthing
ETA	Estimated Time of Arrival
ETD	Expected Time of Departure
ETS	Expected Time of Sailing
FPP	Fixed Pitch Propeller
GC	great circle
RL	rhumb line
GLONASS	Global Orbiting Navigation Satellite System
GHA	greenwich Hour Angle
LHA	local Hour Angle
SHA	sideral Hour Angle
DGLO	differential Global Orbiting Navigation Satellite System
GNSS	global navigation satellite system
GMT	greenwich mean time
UTC	Universal time coordinated
TAI	time atomic international
GT	gross tonnage
NT	net tonnage
GZ	guard zone
HDG	heading
HDOP	horizontal dillusion of precision
HO	hydrographic office
IALA	international association of lighthouse authorities
IBS	integrated bridge system
IHO	international hydrographic organization
IMO	international maritime organization