Sperry Marine Visionmaster FT ECDIS, Руководство пользователя

Страница: 87 / 531

ECDIS User Guide Basic Operation of ECDIS
3-19 65900012
To change the presentation mode, do the following:
Left Click the presentation mode button. This will cycle through the
available choices for the presentation mode (N Up and C Up only).
Or:
Right click on the presentation mode button. A list of
available presentation modes will be shown in a drop
down menu with the currently selected presentation
mode ticked(unavailable modes will be greyed out).
Left click on the presentation mode you want to use.
North Uniformity
In certain presentation modes / conditions, north cannot be
displayed as uniform. When this occurs uniformity is then
calculated from the centre of the displayed screen and the
term "at centre" will appear beneath the north arrow. The
following presentation modes / conditions will trigger this -
When in Polar Stereographic Projection
- In North Up (NUP) mode at scale values of 1:5,000,000 and higher
- In Course Up (CUP) mode at scale values of 1:3,000,000 and higher
In Polar Stereographic Projection or Mercator
- For latitudes above 70deg. at any scale
Presentation Mode dictated by Raster Charts
If raster charts are being displayed the presentation mode is dictated by the
orientation of the currently loaded chart. If the displayed chart is a north
oriented raster chart then North Up (N UP) will be the only available
presentation mode. If the raster chart is not north oriented, then Chart Up
(CH UP) will be the only presentation mode available.
The presentation mode will change automatically when the type of
displayed raster chart changes. This could be due to own ship sailing
across an area covered by more than one type of raster chart.
If the secondary window is displaying a vector chart then the vector chart is
displayed with the same orientation as the raster chart.
For more information on raster charts, refer to `Using Raster Charts’ in
Chapter 4 Charts.