NAV 44/7/8
Appendix F
6. DISPLAY MODE
6.1 North up orientation should
normally be used. If other than north-up orientation is used,
the ECS should indicate the orientation of the display, and
the direction of north.
6.2 The display should be refreshed
and. when necessary, the next chart brought up automatically,
so as to maintain an adequate look-ahead.
7. COLOURS AND SYMBOLS
7.1 The display should use colours to
aid in distinguishing between features.
7.2 If the colours and symbols used
differ significantly from the paper chart, a legend of
colours and symbols should be provided.
7.3 Chart features and symbols should
be large and bold enough to be clearly visible. The own-ship
symbol should be immediately visible at a glance.
7.4 Means should be provided to
ensure that the use of the ECS at night will not adversely
affect night vision.
7.5 It should be possible to
unambiguously operate the controls of the ECS at night.
8. ROUTE PLANNING AND ROUTE
MONITORING
8.1 Mariners should bear in mind that
the use of an ECS does not relieve them of their
responsibility to plan, monitor and record their voyage on
the paper chart, in accordance with the accepted principles
of safe watchkeeping.
8.2 The ECS should provide tools and
procedures for displaying a planned route.
8.3 During route monitoring the ships
position should be displayed and updated frequently, and the
past track should remain on the display long enough to show
trends.
8.4 The ECS should give an alarm if
the position input is lost. The ECS should rep at. as an
indication only, any alarms originating in the positioning
sensor in use.
8.5 The ECS should give an alarm if
the computer fails (e.g, display freeze).
9. CONNECTIONS WITH OTHER
EQUIPMENT
9.1 The ECS should be connected to a
system providing continuous position fixing.
9.2 The ECS should not degrade the
performance of any equipment to which it is interfaced.
10. POWER SUPPLY
10.1 A brief power-break should not
interrupt route monitoring.
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