Seiwa Tigershark Plus - Manual (Page 62)

64 User Manual
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Course Line (Time Line)
The Course Line is a graphical indication of the direction in which the Vessel is
heading. The Course Line origin is the vessel’s position so the time line move-
ment is synchronized with the vessels Icon. Course Line "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 courseline 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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Data Window Mode
To customize the Text Area layout among Full Screen, Text Area with 3 boxes
and Text Area with 6 boxes
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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 Coordi-
nate Systems. There are many different Datum in use, each one gives differ-
ent Lat/Lon positions for an identical point on the surface of the earth (see
also Map Datum and Fix Datum).
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Dead Reckoning
It is the procedure to determine the current position of a vessel by applying to
the last known position the way that has been made (since the last known
position was received). This procedure is normally based on the last received
GPS position, Speed and Course or to the last received GPS position, Log
Speed and Heading.
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Default
It indicates the original factory setting for any menu selection. The default
values are set after a Master Reset (RAM Clear).
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Depth Area
It is the sea area included in the (user selectable) range of minimum and
maximum depth limits. The selected depth area is uniformly filled with a
predefined color.
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Depth Line
(Also called Bathymetric Line) It is the imaginary line connecting points of
equal water depth.
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Destination
In order to tag on the chart the point, towards which the ship is Heading, you
can use a special mark, called destination. When the destination is placed, all
navigation data referred to this point.
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DGPS = Differential GPS
Provides even greater positioning accuracy than standard GPS.
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DPT = Depth from Transducer
Water Depth below the Transducer. The Distance from the Depth Transducer to
the ground.
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DST = Distance
The geographical distance between two points on the map. It is possible to
select the unit among Nm, Sm and Km.
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ETA = Estimated Time of Arrival
The predicted time of reaching a destination or Waypoint
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File
Collection of information (of the same type) stored on a User C-CARD. Each