from version 11.5, downloading and installation
and updates are fully integrated in ScanNav. Refer to the Installation
guide in pdf for full instructions.
S57 format is the standard
chosen for official ENC charts. ENCs are distributed according
S63 scheme which is an encrypted encapsulation of S57.
is an International organization that centralizes Official ENCs from
the Hydrographic Offices of countries member of the IHO. Charts are
directly issued from the HO of concerned countries with updates
delivered weekly. For more general information, you can consult this article from the SHOM , other SHOM
documents at http://www.shom.fr/fr_page/fr_act_cartographie/index_act_carteelectro.htm
or on the IHO web site at http://www.iho.int
ScanNav supports Official ENCs in their S57 and S63
formats, and is referenced as a Primar
You can personalize the
display of vector ENCs using the "ENCs S57" tab of ScanNav's preferences. You may save
personal settings under different named configurations using the "Save
settings" button, and switch easily between these configurations or
restore the factory defaults using the "Load settings" button.
|| - "Viewed items filter":
lets you filter certain chart features to have a lighter
display (unchecked features are hidden)
- "Sounds optimization" lets you eliminate
deeper sounds when zooming out, so as to remain readable while keeping
the most dangerous sounds.
- "Avoid names overlap"
Eliminates texts that overlap when information is too dense, so as to
keep a clear display.
- "Hide names under zoom
level" : Names will be hidden if zooming out under the
given value, so as to keep things readable.
- "Use Scamin attribute":
each chart object may contain an attribute "scamin" indicating not to
display this object under a certain scale, so as to clarify
display. By unchecking this option, this attribute is ignored and these
objects will display whatever the scale.
- "Show text information
in national language": Names and other text information
may be displayed either in English for all charts, or
in language of the originating
country of each ENC.
- "Show simplified rock area"
will result in a faster, but less explicit display of rock areas.
- "Reference resolution":
Lets you tune the resolution used to display ENCs at native
scale. If you consider a 1/1 ratio, it will not be sufficient to render
all details without overlapping due to screen technology which is
around 72 to 96 dpi. A ratio of 2
or 3 will be more comfortable to see all details. It is very similar to
paper charts that are scanned around 200dpi and displayed on screen
that are around 72 to 96 dpi.
- "Max number of cached cells":
number of cells that will be kept in memory so as not to have to reload
when passing from one to the other, therefore increasing performances.
- "Character fonts":
Lets you tune size / color / type and highlighting of
different texts. You can also tune the size of symbols with the "Symbol Size" ruler.
|- OverZoom: Users are
often confused thinking that vector charts have infinite details when
zooming in, which is totally false. A chart, vector, or
has always a compilation scale in which it was designed. In
is put in evidence by thickening contour lines, text, etc... The user
can therefore visually realize (in addition to the scale indicated in
the title bar) that no extra details is coming up when zooming too
as he would see with raster charts. Although it is not
recommended, this option can be deactivated by unchecking "Thicken
lines on overzoom".
- "Contour Mode":
Lets you overlap S57 charts to raster charts to check them or combine
for example with Google screen shots (need to deactivate the automatic
- "Use Lambert II ext projection":
overlap ENCs on top of MrSid Aerial photos that are in Lambert
projection. Warning: it is nevertheless strongly recommended to only
this possibility temporarily, and switch back to standard Mercator
projection for navigation usage.
Starting from version 14.1, it is possible to choose Soundings and Heights units
in ENCs between Meters (default), Feet, or Fathom. This option not only
impacts the charts display, but also all fields related to deths and
heighs in the ENC settings, and also "dynamic sounds" units (see
below). It has nevertheless
no impact on the S57 charts information window which always displays
raw information as coded in the ENCs, so always in Meters.
changing back and forth between units might engender rounding errors.
For example switch from Meters to Fathom then back to Meters might
change a value of 2m to 1.99m. On another side, the internal reference
in ENCs is expressed in Meters which is the IHO International standard,
including for countries using imperial units. This can lead to
display of soundings with an excess of precision.
Lets you highlight sounds under a given value, to put them in evidence
using specific text display. Important
warning: Dangerous sounds will evolve according to the depth correction
entered (see below)
Lets you customize colors for different depth areas. A tip is to enter
in the first cell the minimum security depth with a specific color. All
depths areas containing sounds above this value will therefore be be
put in evidence, highlighted with the given color. Important warning:
Depth areas will evolve according to the depth correction
entered (see below)
This option activates the depth correction control in the menu bar to
enable the dynamic
sounds feature according to a water level at a given
this feature modifies sounding values displayed on the chart.
process is to enter the water level of the current tide. For
example, if you enter a value of 3m, a sound of "1" meter will be
displayed "4" meters, and will therefore not correspond to
the hydrografic zero anymore.
When the option "Depth correction" is checked with a value different to
0, the text field will be highlighted in red to signal that soundings
have been modified.
As soon as you start modifying the value, it will be highlighted in
yellow to indicate that a modification is pending, and that soundings
on the charts are therefore in an undetermined state. It will switch
back to red (or white if value is 0), as soon as you validate the
modification by hitting the "Enter" key, or clicking elsewhere, or
automatically after 5 seconds; and soundings on the chart will be
- By unchecking the option, the input field will switch
to gray, and soundings will be back to their standard values.
This feature only concerns ENC/S57 charts. Soundings displayed
on other types of charts (Navionics, rasters,...) are not affected.
You must therefore be very careful when using different types of
charts altogether. The "Activate sounds delta" control will only show
up if some ENCs are present in you charts library.
Querying ENCs :
ENCs are designed with a vector technology, bringing
information for each object inside the chart (lights, buoys, sounds,
etc...) . All objects can be queried for additional information with
the following specific S57 information window. To open it, use
the icon, or menu "Option" -> "S57 info".
(refer to the general documentation to configure custom toolbars in
case is not present)
When clicking on the map, the top part of the window will list objects
intersecting the clicked point.
selecting a line, the corresponding object will be highlighted on the
map, and textual information relative to this object will be
listed in the bottom part of the dialog (for ex. light characteristics,
sounding values, etc...)
- Certain objects have additional information in
a separate text file. When this is the case, a button will show up at the bottom of
the window. Clicking on it will display the corresponding text file in
a separate window.
- Other objects can also be associated to a photo
or other illustration. In this case the button will show up and clicking
on it will show the photo in a new window.
- The window can be re-sized for more visibility,
and proportion of the 2 sub-windows may be changed by dragging the
of ENCs and insertion in ScanNav's Charts library:
are managed in the same way as Raster charts (BSB, etc...) through the
Charts Library. The library may contain a mix of Vector and Raster
To insert a full pack of encrypted ENCs, you just have to
insert the "enc.pmt" file from the ENC_ROOT directory, which will add
all present ENCs in one step.
To insert non encrypted S57 files (such as free US S57 chart available
the process is similar, just use file "CATALOG.031" instead of
For version 11.5 and above, please refer to the installation
guide in pdf format for a full description of the
older versions, please refer to the S63Insall documentation (accessible
from the Windows "start" menu, then in ScanNav folder)