Leica MX400 Operating Instructions Manual page 226

(elevation angle >0°) from the location of the navigator and is,
therefore, available for acquisition. The navigator will not use
satellites with an elevation angle < 5°.
VMG
See VELOCITY MADE GOOD.
WAYPOINT
A point, usually along the track of the vessel or vehicle, whose
position coordinates may be stored in the navigator. The point
position is the basis for the heading, range, heading-to-steer,
estimated time of arrival, and steering display calculations.
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 before 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)
World-wide datums (WGS 72 and WGS 84) used for satellite
navigation systems. The main difference between WGS 72 and
WGS 84 is a small eastward shift. The resulting difference in
position will normally be 0.01 minute longitude, which will not
be noticeable on charts of scale 1:50 000 or smaller. You may