10.1 It should be possible to carry out route
planning and route monitoring in a simple and reliable manner.
10.2 ECDIS should be designed following ergonomic
principles for user-friendly operation.
10.3 The largest scale data available in the SENC
for the area given should always be used by the ECDIS for all alarms
or indications of crossing the ship’s safety contour and of
entering a prohibited area, and for alarms and indications according
to appendix 5.
10.4.1 It should be possible to carry out route
planning including both straight and curved segments.
10.4.2 It should be possible to adjust a planned
route by, for example:
-
.1 adding waypoints to a route;
-
.2 deleting waypoints from a route;
-
.3 changing the position of a waypoint;
-
.4 changing the order of the waypoints in the
route.
10.4.3 It should be possible to plan an alternative
route in addition to the selected route. The selected route should
be clearly distinguishable from the other routes.
10.4.4 An indication is required if the mariner
plans a route across an own ship’s safety contour.
10.4.5 An indication is required if the mariner
plans a route across the boundary of a prohibited area or of a geographical
area for which special conditions exist (see appendix 4).
10.4.6 It should be possible for the mariner to
specify a limit of deviation from the planned route at which activation
of an automatic offtrack alarm should occur.
10.5.1 For route monitoring the selected route
and own ship’s position should appear whenever the display covers
that area.
10.5.2 It should be possible to display a sea
area that does not have the ship on the display (e.g. for look ahead,
route planning), while route monitoring. If this is done on the display
used for route monitoring, the automatic route monitoring functions
(e.g. updating ship’s position, and providing alarms and indications)
should be continuous. It should be possible to return to the route
monitoring display covering own ship’s position immediately
by single operator action.
10.5.3 ECDIS should give an alarm if the ship,
within a specified time set by the mariner, is going to cross the
safety contour.
10.5.4 ECDIS should give an alarm or indication,
as selected by the mariner, if the ship, within a specified time set
by the mariner, is going to cross the boundary of a prohibited area
or of a geographical area for which special conditions exist (see appendix 4).
10.5.5 An alarm should be given when the specified
limit for deviation from the planned route is exceeded.
10.5.6 The ship’s position should be derived
from a continuous positioning system of an accuracy consistent with
the requirements of safe navigation. Whenever possible, a second independent
positioning method of a different type should be provided; ECDIS should
be capable of identifying discrepancies between the two systems.
10.5.7 ECDIS should provide an alarm when the
input from the position-fixing system is lost. ECDIS should also repeat,
but only as an indication, any alarm or indication passed to it from
a position-fixing system.
10.5.8 An alarm should be given by ECDIS if the
ship, within a specified time or distance set by the mariner, is going
to reach a critical point on the planned route.
10.5.9 The positioning system and the SENC should
be on the same geodetic datum. ECDIS should give an alarm if this
is not the case.
10.5.10 It should be possible to display an alternative
route in addition to the selected route. The selected route should
be clearly distinguishable from the other routes. During the voyage,
it should be possible for the mariner to modify the selected sailing
route or change to an alternative route.
10.5.11 It should be possible to display:
-
.1 time-labels along ship’s track, manually
on demand and automatically at intervals selected between 1 and 120
m; and
-
.2 an adequate number of: points, free movable
electronic bearing lines, variable and fixed-range markers and other
symbols required for navigation purposes and specified in appendix 3.
10.5.12 It should be possible to enter the geographical
co-ordinates of any position and then display that position on demand.
It should also be possible to select any point (features, symbol or
position) on the display and to read its geographical co-ordinates
on demand.
10.5.13 It should be possible to adjust the ship’s
geographical position manually. This manual adjustment should be noted
alphanumerically on the screen, maintained until altered by the mariner,
and automatically recorded.
10.6.1 ECDIS should store and be able to reproduce
certain minimum elements required to reconstruct the navigation and
verify the official database used during the previous 12 h. The following
data should be recorded at one-minute intervals:
-
.1 to ensure a record of own ship’s past
track: time, position, heading, and speed; and
-
.2 to ensure a record of official data used: ENC
source, edition, date, cell and update history.
10.6.2 In addition, ECDIS should record the complete
track for the entire voyage, with time marks at intervals not exceeding
4 h.
10.6.3 It should not be possible to manipulate
or change the recorded information.
10.6.4 ECDIS should have the capability to preserve
the record of the previous 12 h and of the voyage track.