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Definition
Autopilot
COG (Course Over
Ground)
Course
Cross track distance
Cross track error
Cross-track limit
Curved track
ECDIS (Electronic Chart
Display and Information
System)
Electronic Navigational
Charts
Heading
Heading control
HCS (Heading Control
System)
Heading Monitor System
Helm
IEC
Indication
Latitude and Longitude
LOG
8 | Introduction
Description
A Heading Control System.
COG is the actual direction of progress of a vessel, between two
points, with respect to the surface of the earth. The vessel's heading
may differ from the COG because of wind, tide and currents.
A vessel's course is the cardinal direction along which the vessel is to
be steered. It is to be distinguished from the vessel's heading, which is
the compass direction in which the craft's bow is pointed.
Perpendicular distance of the vessel from the track including direction
(negative if the vessel is left of the intended track)
See 'Cross track distance'
Maximum cross track distance before an alert is activated.
Non-straight track between two straight legs.
A geographic information system used for nautical navigation that
complies with IMO regulations as an alternative to paper nautical
charts.
An ECDIS displays the information from ENC or DNC and integrates
position information from position, heading and speed through water
reference systems and optionally other navigational sensors. Other
sensors which could interface with an ECDIS are radar, Navtex,
Automatic Identification Systems (AIS), and depth sounders.
An official database created by a national hydrographic office for use
with an ECDIS.
The horizontal direction in which a vessel points or heads at any
instant, expressed in angular units from a reference direction, usually
from 000° at the reference direction clockwise through 360°.
Control of the vessel's heading.
A system which enables a vessel to keep a pre-set heading with
minimum operation of the vessel's steering gear, within limits related
to the vessel's manoeuvrability in conjunction with their sources of
heading information. The HCS may work together with a TCS.
A turn rate control or a turning-radius control for performing turns
may be provided.
The term HCS differentiates the automatic pilot (autopilot) from a
system designed to keep a vessel on a pre-determined track
throughout its passage, which is called TCS.
This system monitors the actual heading sensor by an independent
second source.
A wheel or tiller by which a vessel is steered.
A non-profit, non-governmental international standards organization
that prepares and publishes International Standards for all electrical,
electronic and related technologies.
Visual display of any message to the user which may be accompanied
by a low intensity acoustic signal to gain attention.
The units that represent the coordinates at geographic coordinate
system.
Speed data from Water Speed Log
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