NAV 44/7/4
Appendix 3
BACK-UP REQUIREMENTS
[As proposed to HGE by Coast Survey/NOAA (USA), 6 October
1997]
1. INTRODUCTION
1.1 As prescribed In section 14 of
this performance standard, adequate independent back-up
arrangements should be provided to ensure safe navigation in
case of RCDS failure. Such arrangements should include:
.1 facilities enabling a safe
taking-over of the RCDS functions in order to ensure that
an RCDS failure does not result in a critical situation;
.2 a means to provide for safe
navigation for the remaining part of the voyage in case
of RCDS failure.
2. PURPOSE
2.1 The purpose of an RCDS back-up
system is to ensure that safe navigation is not compromised
in the event of RCDS failure. This should include a timely
transfer to the back-up system during critical navigation
situation. The back-up system shall allow the vessel to be
navigated safety until the termination of the voyage.
3. FUNCTIONAL REQUIREMENTS
3.1 Required functions and their
availability
3.1.1 Presentation of chart information -
The back-up system should display in graphical (chart) form
the relevant information of the hydrographic and geographic
environment which are necessary for safe navigation.
3.1.2 Route planning - The back-up system
should be capable of performing the route planning functions,
including:
.1 taking over of the route plan
originally performed on the RCDS;
.2 adjusting a planned route manually or by
transfer from a route planning device;
3.1.3 Route monitoring - The back-up system
should enable a take-over of the route monitoring originally
performed by the RCDS, and provide at least the following
functions:
.1 plotting own ship's position
automatically, or manually on a chart;
.2 taking courses, distances and bearing from the
chart;
.3 displaying the planned route;
.4 displaying time labels along ship's track;
.5 plotting and adequate number of points, bearing
lines, range markers, etc., on the chart.
3.1.4 Display information - If the back-up
is an electronic device, it should be capable of displaying
the information equivalent to RNC defined in this standard or
information equivalent to the standard display as defined in
the performance standard for ECDIS.
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