Memorex RX 1 Smart Manual de Instalação descarregar pdf (Página 198)

196 | Appendix E - Glossary

VTS

Vessel Traffic Service

WAYPOINT

A point, usually along the track of the vessel or vehicle, whose position

coordinates may be stored in the navi gator. 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)

Worldwide 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 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 provided by GNSS receivers.

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Memorex RX 1 Smart Manual de Instalação Página 198