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Version 2.0
Operator’s Manual
Glossary
VELOCITY MADE GOOD (VMG)
The speed by which the vessel is moving in the upwind direction.
When tacking, the optimization should be based on VMG (assum-
ing that TWD is expected to be fairly constant). See also
WAYPOINT CLOSURE VELOCITY.
VHF
Very High Frequency – A set of frequencies in the MHz region.
VISIBLE SATELLITE
A satellite whose orbit has placed it above the earth’s horizon (el-
evation angle >0°) from the location of the navigator and is, there-
fore, available for acquisition. The navigator will not use satellites
with an elevation angle < 5°.
VMG
See VELOCITY MADE GOOD.
VTS
Vessel Traffic Service
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, esti-
mated 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 ex-
pected 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.
Summary of Contents for MX420
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