Operation Manual

140 User Manual
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 Chain
Selects the preferred chain. The Loran chains are groups of transmitting stations that use timed radio pulse
transmissions. In each of these chains there is a master station and two or more slave or secondary stations.
Stations belonging to a same chain transmit pulses in timing groups: a different time base identifies each chain.
The time base of each chain is the Group Repetition Interval or GRI. This GRI identifies the chain in unique
mode. For example the GRI = 4990 identifies the chain of Central Pacific zone.
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 Chart Lock
When Chart Lock is On, the available zoom scales are only the ones containing cartographic data. Instead
when Chart Lock is Off, it is possible to zoom down into zoom scales not covered by cartographic data after
the last available zoom scale covered by cartographic data.
Warning
When an empty level is entered, the message “No cartographic coverage” is shown on a window in a corner of the
map display. The warning message is always displayed as long as the current zoom has no data coverage.
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 Charting
The cursor is shown on the map and the Zoom functions refer to its position. When in Charting mode, if the
ship icon moves off screen, the chart is not centered on it.
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 COG = Course Over Ground
Direction of the path over ground actually followed by a vessel.
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 Correction
To compute fix error in automatic mode, place cursor on ship's real position and then follow the procedure
(compute correction). It is also possible to compute the fix error in manual mode (correction offset). Once
you computed the error, you can turn the fix correction On or Off.
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 Course Vector
Graphical indication of the direction in which the Vessel is heading. The Course Vector origin is the vessel’s
position so the time line movement is synchronized with the vessels Icon. Course Vector course is given by
the value of COG (Course Over Ground) and its length is proportional to the SOG (Speed Over Ground).
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 CTS = Course To Steer
The optimum direction the boat should be steered in order to efficiently make headway back to the course
line while also proceeding toward the destination Waypoint.
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 Cultural Features
Any man-made topographic feature as built-up area, buildings, roads, ....
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 Datum
The Latitude and Longitude lines printed on any map are based on certain models of the shape of the earth:
these models are called Datum or Coordinate Systems. There are many different Datum in use, each one
gives different Lat/Lon positions for an identical point on the surface of the earth.
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 Default
Indicates a value or a setting which is used if the user has not defined a particular value. You can modify this
value using the menu settings.
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 Depth Area Range
The sea area that is beyond the selected range is filled by an uniform white color, the sea area that is inside
the selected range is filled by ordinary multicolor shading. The Spot Soundings and Depth Contours are
displayed on the range only.
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 Depth Lines
Imaginary lines connecting points of equal water depth.
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 DGPS = Differential GPS
Provides even greater positioning accuracy than standard GPS.