Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

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ECDIS User Guide Navigation Tools
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Grid
A latitude/longitude (L/L) grid can be displayed on the chart window. The
L/L grid values are taken from the latest valid position of own ship’s
CCRP ,
as reported by the Position sensor, see `Position’ in Chapter 3, Basic
Operation of ECDIS.
The L/L grid is only displayed when the presentation mode is N-UP. The
grid is removed from the display if the presentation mode is changed to C-
UP.
The grid display will vary between two latitude and three longitude lines,
and four latitude and four longitude lines, based on the selected scale ratio
of the display.
The L/L grid will not be displayed when the chart orientation is 45° to 135°
and from 225° to 315°
To turn the grid on or off tick the Display L/L
Grid check box.