User's Manual

Table Of Contents
NACOS Platinum
ED 3100 G 140 / 04 (2011-11)
Operating Instructions
C-2 Chart and Route Monitoring
C VOYAGE PLANNING & MONITORING.fm
C-36
An alarm given in the Alarm Line and in the Alarm List and referencing chart objects ahead or at the
own ship's position can be caused by several different violations of chart objects being touched or
crossed:
- Each basic alarm reason (i.e. each type of object related alarms) creates a circular symbol showing
the location of the violation by the own ship contour or the look ahead sector.
- Holding the cursor on the circular symbol, opens the chart alarm list with detailed descriptions for
this location. The additional alarm text information is taken from the chart database (i.e. is part of
the official electronic charts) or from the user made own chart objects.
Preconditions
So that this Chart Monitoring can serve its purpose, namely increasing the nautical safety, the following
prerequisites must be fulfilled:
- The best possible sensors for position and speed over ground must be selected.
- By means of a comparison between the available position sensors, a check must be performed to
ensure that the selected position sensor is supplying correct and accurate position data.
- If a vector chart is used, it must be available for the entire navigated area. Otherwise, own safety
lines and danger highlights must be made available in the User Symbols data base for the missing
areas.
- If a raster chart is used, own safety lines and danger highlights for all potentially dangerous areas
and objects must exist for the entire navigated area.
- The safety contour value must have been set correctly. See chapter 5.7 on page B-57 for details.
- The used route must have been successfully checked and reasonable settings for the track limit (i.e.
the monitoring strip for the deviation from route alarm) must have been made for each leg.
- The latest relevant nautical warning information received by radio must be taken into account,
possibly by the editing of own safety lines or danger highlights or by manual ENC update (see
chapter Chart Maintenance).
- The check of the used planned route should, if necessary, be repeated after incorporation of the
received warning information.
- The alarm criteria must be correctly set - see the following sections.
- In the case of doubt and once per year, the monitor performance must be checked. See chapter B
- 3.3 on page B-14 for details.