Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Glossary Radar/Chart Radar User Guide
Glossary-14 65900010
TX COMMS: Transceiver Communications
TxRx: Transceiver
U
UTC: Universal Time Coordinated – the international standard of time,
kept by atomic clocks around the world. Formerly known as
Greenwich Mean Time (GMT), local time at zero degrees longitude
at the Greenwich Observatory, England. UTC uses a 24-hour
clock.
V
Variable Range Marker (VRM): An adjustable range ring used to measure
the distance to a target. When the VRM is adjusted over the
leading edge of a return with the cursor control, the distance to the
object is shown on the screen.
Vector: Direct connection between two points, either given as two sets of
coordinates (points), by direction and distance from one given set
of coordinates (True Vector), or a point in a vector space defined
by one set of coordinates relative to the origin of a coordinate
system (Relative Vector).
Vigilance Alarm: A system alert generated when the operator fails to give
evidence of fitness.
VPF: Vector Product Format charts (SevenCs chart format)
W
Watch Alarm: The purpose of a watch alarm system is to monitor bridge
activity and detect operator disability which could lead to marine
accidents. The system monitors the awareness of the Officer of the
Watch (OOW) and automatically alerts the Master or another
qualified OOW if for any reason the OOW becomes incapable of
performing the OOW's duties. This is achieved by a series of
indications and alarms to alert first the OOW and, if no response,
then to alert the Master or another qualified OOW. Additionally, the
watch alarm may provide the OOW with a means of calling for
immediate assistance if required.