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Category
name
Obstruction in the water
(Obstructions)
which is always above water
level
Dangerous underwater rock
of uncertain depth
Rock which covers and
uncovers or is awash at low
water
Wreck showing any portion of
hull or superstructure at level
of chart datum
Non-dangerous wreck, depth
unknown
Dangerous wreck, depth
unknown
Direction of buoyage
Direction and color of
buoyage for approaching
harbor in IALA region A (red
to port)
Direction and color of
buoyage for approaching
harbor in IALA region B
(green to port)
Fairway with one-way traffic
in direction indicated
Fairway with two-way traffic
Inshore traffic
Recommended traffic
direction between parts of a
traffic separation scheme, or
for ships not needing a deep
water route
Object name
B-131
Alert generated when the own
Icon button display
example
Crossing a danger
(dangerous symbol)
Crossing a danger
(dangerous symbol)
Crossing a danger
(dangerous symbol)
Crossing a danger
(dangerous symbol)
Crossing a danger
(dangerous symbol)
Crossing a danger
(dangerous symbol)
No alert
No alert
No alert
No alert
No alert
No alert
No alert
Appendix B Menu List and Materials
ship approaches the object
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
APP B
24
25
27
APP C
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