XTE and CDI!
|23 March 2012||Posted by Alex from Lagoon under Technical world|
While preparing the delivery of a Lagoon 400 that some of you will be able to admire at the international multihull boat show in Lorient from April 18 to 22, 2012, I realized that some GPS abbreviations can be bewildering! As a matter of fact, if you have read some of my latest articles, you certainly know the meaning of COG, VMG or TWA. But what about XTE, DTW, CDI … ?
Let’s go for a little summary of common abbreviations on our electronic equipment, : it cannot hurt, even for the experts!
AWA: Apparent Wind Angle
for more info see here.
AWS: Apparent Wind Speed
for more info see here.
BRG: Bearing to destination
Course toward the next destination point.
BTW: Bearing To Waypoint
Route to the next waypoint.
CDI: Course Deviation Indicator
One of the screens on your GPS allows you to display your boat on a road with two parallel vertical lines : these two lines are called CDI. These lanes identify the track deviation graphically.
CMG: Course Made Good
Route followed from the start.
COG: Course Over Ground
CTS: Course To Steer
Ideal course to follow to reach the destination.
DTG: Distance To Go
Distance from the boat to the arrival destination.
DTW: Distance To Waypoint
Distance to next waypoint.
ETA: Expected Time of Arrival
Estimated time of arrival with SOG constant.
ETE: Estimated Time Enroute
Estimated time to reach the next waypoint selected with SOG constant.
The GOTO function allows you to create a direct route to a point chosen.
GPS: Global Positioning System
LAT / LON.
Position expressed in latitude and longitude
MOB: Man Over Board
NMEA: National Marine Electronics Association
The NMEA is a standard communication of marine electronic equipment controlled by the National Marine Electronics Association.
POI: Points of Interest
Buoy, port …
SOG: Speed Over Ground
STW: Speed Through Water
Tot TTG: Total Time To Go
Estimate of the total time between the starting point and the ending point.
TWA: True Wind Angle
TWD: True Wind Direction
TWS: True Wind Speed
UT or UTC: Universal Time Coordinated, time at the Greenwich meridian.
VMC: Velocity Made on Course
Efficient speed over ground ; for more info see here.
VMG: Velocity Made Good
Efficient speed when nearing the wind direction; for more info see here.
XTE: Cross Track Error
Distance between the boat and the nearest road point of the direct course.
If you are looking for the meaning of an abbreviation not listed here, I recommend the site of the U.S. Coast Guard who have a rather comprehensive list.