Seiwa SW701i SW701e - Manual (Page 94)

96 User Manual
(Course Over Ground) and its length is proportional to the SOG (Speed Over
Ground).
♦
CTS = Course To Steer
Optimum direction the boat should be steered in order to efficiently make
headway back to the courseline while also proceeding toward the destination
Waypoint.
♦
Cultural Features
Any man-made topographic feature as built-up area, buildings, roads.
♦
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).
♦
Dead Reckoning
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.
♦
Default
Original factory setting for any menu selection. The default values are set
after a Master Reset (RAM Clear).
♦
Depth Area
Sea areas included in the user selectable range of minimum and maximum
depth limits. 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 dis-
played on the range only.
♦
Depth Line
(Also called Bathymetric Line) 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.
♦
DGPS = Differential GPS
Provides even greater positioning accuracy than standard GPS.
♦
DPT = Depth from Transducer
Water Depth below the Transducer. The Distance from the Depth Transducer to
the ground.
♦
DST = Distance
Geographical distance between two points on the map. It is possible to select
the unit among Nm, Sm and Km.
♦
ETA = Estimated Time of Arrival
Predicted time of reaching a destination or Waypoint
♦
File
Collection of information (of the same type) stored on a USER MEDIA. Each
file must have a unique name, ideally one that describes its contents. Filenames
are kept in a directory on each USER MEDIA.
♦
Fix
Current position of the vessel provided by the GPS (connected to the chart
plotter or built-in) or other positioning systems.