TERMS AND ABBREVIATIONS
20221859 / F 137
Route A stored sequence of waypoints. These waypoints will be listed in the order in
which you desire to follow them.
RX Receiver
SOG Speed Over Ground. The actual speed of the vessel relative to the ocean floor.
SOLAS SOLAS is the IMO convention to ensure Safety Of Life At Sea.
SPD Speed
STD Standard (Chart display button)
STW Speed Through Water
TBA To be announced
TCPA Time in minutes to Closest Point of Approach for the ARPA target before an
alarm is activated
TPL Transferred Position Line. Position line that has been moved.
TTA Time to last waypoint
TTM NMEA0183 Tracked Target Message
TTW Time to wheel over point
TX Transmitter
USB Universal Serial Bus
UTC Universal Time Coordinates, which is equal to standard time in London (GMT).
UTC is not affected by the local summertime adjustments.
VGA Video Graphics Array
VRM Variable Range Marker
VTG NMEA message (Velocity True Ground) that identifies the actual track made
good and speed over ground
WP Waypoint. A discrete point, stored in a navigator, located on the surface of the
earth. Normally this point will be identified by Lat/Lon coordinates although in
some systems it may be shown by T.D.'s.
Wpt Waypoint
XTE Cross Track Error. Used to identify a vessel’s position relative to a straight line
drawn between two waypoints. The amount the vessel is off to the left or to the
right of this line is known as the Cross Track Error. It is normally displayed in
thousands of a nautical mile, equal to 6 ft or 1.85 m.
ZDA NMEA0183 message that identifies UTC time, day, month, and year, local zone
number, and local zone minutes
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