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Distance to Waypoint
Distance to travel to reach the destination waypoint.
C-B Segment.
Distance to Last Waypoint
Distance to travel to reach the last waypoint on the active
route.
Distance Traveled
Distance the vessel has already traveled.
Cross Track Error (XTE)
Acronym for Cross (X) Track Error. Indicates the distance
between the vessel's current position and the direct line
between your starting point and your destination
waypoint.
The letter R (Right) or L (Left) indicates whether your
vessel is to the right or left of the direct line between your
starting position and your destination waypoint.
C-D Segment.
CPE
Acronym for Circle of Probable Error. Indicates the radius
of the circle containing 50% of the positions calculated by
your GPS. For example, if your CPE is 5 meters, your
actual position is within a radius of 5 meters from the
calculated position.
Coordinates
Unique alphanumeric description of your position on the
globe.
Map datum
Theoretical mathematical model representing the surface
of the earth. The format of the chart that you are using is
indicated in the legend. If you are not sure of which map
datum to use, select the WGS84 format.
NMEA
Acronym for the National Marine Electronic Association, a
professional organization that defines the standard serial
formats used for interfacing electronic devices for
maritime navigation with one another or with computers.
WAAS/EGNOS/MSAS
The WAAS, EGNOS and MSAS systems improve the
standard civilian GPS signal in order to obtain higher
precision in calculating positions. Errors are calculated
based on several ground stations and error corrections
are transmitted to WAAS/EGNOS/MSAS satellites. These
corrections are then transmitted to your GPS receiver,
which interprets them.
These systems are currently being developed, and
depending on your position, may or may not be available.