Si-text trawl plot 12, User Manual, Page: 110 / 118

112 User Manual
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.
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.
Cultural Features
Any man-made topographic feature as built-up area, buildings, roads, ....
Current
Non-periodical movement of sea-water, generally horizontal, due to many causes such as different
temperatures and prevalent winds. Some may be temporary, others permanent.
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.
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.
Depth Contours
Imaginary lines connecting points of equal water depth.
DGPS = Differential GPS
Provides even greater positioning accuracy than standard GPS.
Drift
Horizontal velocity of the water surface.
DTG = Distance To Go
The actual distance to reach the Target.
EBL = Electronic Bearing Line
A dot line with direction set by the user and origin as cursor position.
Event
User Point that refers to the ship's position. It is simply a way of marking where the boat is (see Par. 4.2).
File
Collection of information (of the same type) stored on a Flopy Disk. Each file must have a unique
name, ideally one that describes its contents. Filenames are kept in a directory on each Floppy Disk (see
Par. 4.7).
Floppy Disk
The Floppy Disk drive is used by the chartplotter to save user data: it is the most convenient medium
for storing and retrieving your information. The 3.5" Floppy Disk has rigid plastic cover with metal
shields that guard the disk from dirt and fingerprint. You can “write protect” the Floppy Disk to
preserve the accidental storage of information on disk. The Floppy Disk has a write protect notch; this
notch can be covered with a built-in tab. If the write protection notch is covered by the tab, no data can
be written (saved) to the Floppy Disk. You should store Floppy Disk in a safe place, away from dust,
moisture, magnetism and extreme temperatures. Be sure to label each Floppy Disk you use, since labels
help you identify what data is on the disk and remind you that the disk has information stored on it.