WAYPOINT CLOSURE VELOCITY (WCV)
The speed the vessel is moving in the direction of the
next waypoint. WCV should be used for optimization in
cases where TWD is expected to vary drastically be-
fore the waypoint is reached. See also VELOCITY MADE
GOOD.
WAYPOINT PASS CRITERIA
The criterion by which the navigator determines the
passing of a waypoint. The criterion is selected in CFG 1,
Navigation.
WCV
See WAYPOINT CLOSURE VELOCITY.
WORLD GEODETIC SYSTEM (WGS)
Worldwide datums (WGS 72 and WGS 84) used for satel-
lite navigation systems. The main difference between
WGS 72 and WGS 84 is a small eastward shift. The re-
sulting difference in position will normally be 0.01 minute
of longitude, which will not be noticeable on charts of
scale 1:50 000 or smaller. You may thus use the WGS
84 Plus Offset datum with charts marked with a WGS 72
offset. All charts will eventually be converted to WGS 84
datum.
X-TRACK ERROR (XTE)
See CROSS TRACK ERROR.
1PPS
One Pulse Per Second – A timing signal generally pro-
vided by GNSS receivers.
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