11.1 This message provides dynamic information concerning a specified geographic area, polyline or positions. It should be only used to convey pertinent time-critical navigation safetyinformation to mariners or authorities, and not as a means to convey information already provided by current official nautical charts or publications.
11.2 This message can also be used to convey advisory lines or tracks. However, the Route Information message should be used for recommended or directed routes.
11.3 The information is time-dependent (i.e. has start date and time and duration).
11.4 In order to allow advance notice, this message should be transmitted prior to the start date and time specified for the area. It should not be transmitted more than one day in advance.
11.5 This message should not be transmitted beyond the end date and time, except for a cancellation message. A cancellation message can be transmitted before the designated end date and time using the same Message Linkage ID with an Area Type of 126 (cancellation), a Duration = 0, and start date and time fields all set to not available.
11.6 ECDIS/ECS software should automatically remove the area notice from the display after the end date and time specified or after receiving a cancellation message.
11.7 Up to 5-slots message can be created, however messages with more than 3 slots should be avoided. Messages with more than 3 slots are less likely to be received due to radiofrequency noise or packet collision.
11.8 Waypoints can be specified using the polyline/waypoint sub-area. In case more precision is to be required then multiple circle/point sub-areas can be defined (e.g., one for each waypoint).
11.9 When waypoints are specified using polyline or circle/point sub-areas, they should be numbered and used in the order that they appear in the message.
11.10 Polyline/polygon sub-areas must follow immediately after a point sub-area (Area Shape 0) in the same Area Notice message. The point defines the start of the line segments. If more than 5 points were required for a polyline/polygon, then additional polyline/polygon sub-areas could be used. However, they must follow immediately after the first polyline/polygon sub-area.
11.11 The Message Linkage ID can be used to link additional text (e.g., a separate text message). However, both the Area Notice and additional Text Description message should be sent by the same source MMSI.
11.12 The total area defined by one Area Notice (one Message Linkage ID) is the union of all of the sub-areas contained in the message.
11.13 If the same Message Linkage ID is retransmitted with different sub-areas and/or times, then the ECDIS/ECS should replace the old Area with the new.
11.14 The Message Linkage ID must be unique across all binary messages to which it applies. In this way, the Message Linkage ID and Source MMSI are connected to the same text message.
Table 11.1
Area notice - (broadcast)
|
|
Parameter |
No of bits |
Description |
||
|
Standard Message Header |
Message ID |
6 |
Identifier for Message 8; always 8. |
||
|
Repeat Indicator |
2 |
Used by the repeater to indicate how many times a message has been repeated (see ITU-R M.1371-3, Annex 2, § 4.6.1). 0 - 3 0 = default 3 = do not repeat anymore |
|||
|
Source MMSI |
30 |
MMSI number of source station. |
|||
|
Spare |
2 |
Not used. Set to zero. |
|||
|
Binary Data |
Designated Area Code |
10 |
DAC = 001 |
||
|
Function Identifier |
6 |
FI = 22 |
|||
|
Application Data |
Message Linkage ID |
10 |
A source specific running number, unique across all binary messages equipped with Message Linkage ID. Used to link additional information to the message by a Text Description message. The Message Linkage ID and the first six digits of the source MMSI uniquely identify the sent message. 1 - 1,023 0 = not available = default |
||
|
Notice Description |
7 |
Notice description as defined in Table 11.11 |
|||
|
Start date and time of Area |
UTC Month |
4 |
Start UTC month of the Area notice. 1 - 12 0 = not available = default 13 - 15 (reserved for future use) |
||
|
UTC Day |
5 |
Start UTC day of the Area notice. 1 - 31 0 = not available = default |
|||
|
UTC Hour |
5 |
Start UTC hour of the Area notice. 0 - 23 24 = not available = default 25-31 (reserved for future use) |
|||
|
UTC Minute |
6 |
Start UTC minute of the Area notice. 0 - 59 60 = not available = default 61-63 (reserved for future use) |
|||
|
Duration |
18 |
Minutes until the end of Area notice, measured from start date and time of Area Notice. 262,143 = undefined = default |
|||
|
Sub-areas |
max 870 |
From 1 to 10 sub-areas, each structured as in Tables 11.4 - 11.9. A short text description may be associated with the areas using Sub-area 5: Associated text (see Table 11.10). Total number of sub-areas is determined by the length of the message. Each sub-area is a fixed 87 bits. |
|||
|
Total |
max 981 |
Occupies 2-5 slots (see Table 11.3) |
|||
Table 11.3
Number of slots
|
Number of sub-areas transmitted |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
|
Number of bits used for a broadcast message |
198 |
285 |
372 |
459 |
546 |
633 |
720 |
807 |
894 |
981 |
|
Number of slots used for a broadcast message |
2 |
2 |
3 |
3 |
3 |
4 |
4 |
4 |
5 |
5 |
|
Number of bits used for an addresses message |
230 |
317 |
404 |
491 |
578 |
665 |
752 |
839 |
926 |
1013 |
|
Number of slots used for an addressed message |
2 |
2 |
3 |
3 |
3 |
4 |
4 |
5 |
5 |
5 |
Table 11.4
Sub-area table
|
Number |
Area Shape |
Table for Definition |
|
0 |
circle or point |
11.5 |
|
1 |
rectangle |
11.6 |
|
2 |
sector |
11.7 |
|
3 |
polyline |
11.8 |
|
4 |
polygon |
11.9 |
|
5 |
associated text |
11.10 |
|
6 - 7 |
reserved |
-- |
Table 11.5
Circle or point
|
Parameter |
No of bits |
Description |
|---|---|---|
|
Area Shape |
3 |
Defines the shape of the area. |
|
Scale Factor |
2 |
Scale factor. This is a multiplier for the dimensions of the shape. |
|
Longitude |
25 |
Longitude of the centre in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default |
|
Latitude |
24 |
Latitude of the centre in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative). 91 degrees = not available = default |
|
Precision |
3 |
Precision of data in latitude and longitude parameters. Data to be truncated to the number of decimal places specified in this parameter. 0 - 4 4 = default |
|
Radius |
12 |
Defines the size of the circular area. This is the radius of the circle in metre steps. 1 - 4,095 metres This is multiplied by the scale factor to give a maximum size of 4,095,000 metres (4,095 km). |
|
Spare |
18 |
Not used. Set to zero. |
Table 11.6
Rectangle
|
Parameter |
No of bits |
Description |
|
Area Shape |
3 |
Defines the shape of the area. |
|
Scale Factor |
2 |
Scale factor. This is a multiplier for the dimensions of the shape. |
|
Longitude |
25 |
Longitude of the SW corner in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default |
|
Latitude |
24 |
Latitude of the SW corner in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative). 91 degrees = not available = default |
|
Precision |
3 |
Precision of data in latitude and longitude parameters. Data to be truncated to the number of decimal places specified in this parameter. 0 - 4 4 = default |
|
E dimension |
8 |
Box dimension East from the corner point, in metre steps. This is multiplied by the scale factor to give a maximum dimension of 255,000 metres (255 km). 0 = line North-South (default) 1 - 255 * scale factor metres. |
|
N dimension |
8 |
Box dimension North from the corner point, in metre steps. This is multiplied by the scale factor to give a maximum dimension of 255,000 m (255 km). 0 = line East-West (default) 1 - 255 * 10^scalefactor metres |
|
Orientation |
9 |
Rotation of area, in degree steps. Area is rotated clockwise this number of degrees about the position above. 1-359 = rotation in degrees 360-511 (reserved for future use) |
|
Spare |
5 |
Not used Set to zero. |
Figure 11-1
Description of the process required to define a "rectangle" area
Table 11.7
Sector
|
|
Parameter |
No of bits |
Description |
|
Area Notice: Sub-area |
Area Shape |
3 |
Defines the shape of the area. Set 2 for Sector. |
|
Scale Factor |
2 |
Scale factor. This is a multiplier for the dimensions of the shape. |
|
|
Longitude |
25 |
Longitude of the centre in 1/1,000 min, ±180 degrees as per 2's complement (East = positive, West = negative). 181 = not available = default |
|
|
Latitude |
24 |
Latitude of the centre in 1/1,000 min, ±90 degrees as per 2's complement (North = positive, South = negative). 91 degrees = not available = default |
|
|
Precision |
3 |
Precision of data in latitude and longitude parameters. Data to be truncated to the number of decimal places specified in this parameter. 0 - 4 4 = default |
|
|
Radius |
12 |
Defines the size of the sector, in metre steps. This is multiplied by the scale factor to give a maximum size of 4,095,000 m (4095 km). 0 = point = default 1 - 4,095 metres |
|
|
Left Boundary |
9 |
Orientation of the left boundary edge of the sector, in degree steps measured clockwise from true North about the centre point. 0 = no rotation= default 1 - 359 = rotation in degrees 360-511 (reserved for future use) |
|
|
Right Boundary |
9 |
Orientation of the right boundary edge of the sector, in degree steps measured clockwise from true North about the centre point. The total sector area is the area measured from the left boundary clockwise to the right boundary. 0 = no rotation= default 1 - 359 = rotation in degrees 360-511 (reserved for future use) |
|
|
|
Spare |
0 |
Not used. Set to zero. |
Figure 11-2
Sector Area
a) Centre point
b) Sector radius
c) Sector bearings from centre point, left boundary
d) Sector bearings from centre point, right boundary
|
|
Parameter |
No of bits |
Description |
|
Area Notice: Sub-area |
Area Shape |
3 |
Defines the shape of the area. Set to 3 for Polyline (open area or line). The initial point (point 0) is defined by an Area Shape = 0 (circle) |
|
Scale Factor |
2 |
Scale factor. This is a multiplier for the dimensions of the shape. |
|
|
Point 1 Angle |
10 |
True bearing, in half-degree steps, from Point 0 to Point 1 or from the last Point in a Polyline directly preceding this Polyline. 720 = not available = default 721 - 1,023 (reserved for future use) |
|
|
Point 1 Distance |
10 |
Distance, in metre steps, from Point 0 to Point 1 or from the last Point in a Polyline directly preceding this Polyline. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
Point 2 Angle |
10 |
True bearing, in half-degree steps, from Point 1 to Point 2. 720 = not available (no point) = default 721 - 1,023 (reserved for future use) |
|
|
Point 2 Distance |
10 |
Distance, in metre steps, from Point 1 to Point 2. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
Point 3 Angle |
10 |
True bearing, in half-degree steps, from Point 2 to Point 3. 720 = not available (no point) = default 721 - 1,023 (reserved for future use) |
|
|
Point 3 Distance |
10 |
Distance, in metre steps, from Point 2 to Point 3. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023km). 0 = default (no point). |
|
|
Point 4 Angle |
10 |
True bearing, in half-degree steps, from Point 3 to Point 4. 720 = not available (no point) = default 721 - 1,023 (reserved for future use) |
|
|
Point 4 Distance |
10 |
Distance, in metre steps, from Point 3 to Point 4. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
|
Spare |
2 |
Not used. Set to zero. |
Figure 11-3
Graphic description of a waypoint/polyline, showing angle and distance between points
(if one side of a polyline is to be a boundary (e.g., edge of ice area), this is defined by the left side of the line in order of sequence from the initial sub-area point (Point 0))
Figure 11-4
Graphic depiction of:
1) ice boundary between sea ice and open water, and
2) recommended route through the sea ice area
Figure 11-5
Graphic depiction of a storm front message
|
|
Parameter |
No of bits |
Description |
|
Area Notice: Sub-area |
Area Shape |
3 |
Defines the shape of the area. Set to 4 for Polygon (closed area). The polygon shape is closed by connecting the last defined point back to the initial point (Point 0). To be preceded by an Area Shape = 0 (circle) |
|
Scale Factor |
2 |
This is a multiplier for the dimensions of the shape. |
|
|
Point 1 Angle |
10 |
True bearing in half-degree steps, from Point 0 to Point 1 or from the last Point in a Polygon directly preceding this Polygon. 720 = not available = default 721 - 1,023 (not for use) |
|
|
Point 1 Distance |
10 |
Distance in metre steps, from Point 0 to Point 1 or from the last Point in a Polygon directly preceding this Polygon. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). |
|
|
Point 2 Angle |
10 |
True bearing in half-degree steps, from Point 1 to Point 2. 720 = not available (no point) = default 721 - 1,023 (not for use) |
|
|
Point 2 Distance |
10 |
Distance in metre steps, from Point 1 to Point 2. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
Point 3 Angle |
10 |
True bearing in half-degree steps, from Point 2 to Point 3. 720 = not available (no point) = default 721 - 1023 (reserved for future use) |
|
|
Point 3 Distance |
10 |
Distance in metre steps, from Point 2 to Point 3. This number (1 - 1,023) is combined with the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
Point 4 Angle |
10 |
True bearing in half-degree steps, from Point 3 to Point 4. 720 = not available (no point) = default 721 - 1,023 (not for use) |
|
|
Point 4 Distance |
10 |
Distance in metre steps, from Point 3 to Point 4. This number (1 - 1,023) is multiplied by the scale factor to give a maximum of 1,023,000 metres (1,023 km). 0 = default (no point). |
|
|
|
Spare |
2 |
Not used. Set to zero. |
Table 11.10
Associated text
|
Parameter |
No of bits |
Description |
|
|
Area Notice Sub-area |
Area Shape |
3 |
Defines the shape of the area. Set 5 for Associated text. This text is associated with the area defined in this binary message. Multiple Associated text sub-areas are glued together in the order they appear in the message. |
|
Text |
84 |
14 characters 6-bits ASCII characters, as defined in ITU-R M. 1371-3, Table 44. If less than 14 characters are required, then the remainder of the field should be filled with "@" characters. |
|
|
Spare |
0 |
Not used. Set to zero. |
Table 11.11
Notice Description
|
Caution Area: Marine mammals habitat |
32 |
Restricted Area: Fishing prohibited |
64 |
Distress Area: Vessel disabled and adrift |
96 |
Chart Feature: Sunken vessel |
|
|
1 |
Caution Area: Marine mammals in area -reduce speed |
33 |
Restricted Area: No anchoring. |
65 |
Distress Area: Vessel sinking |
97 |
Chart Feature: Submerged object |
|
2 |
Caution Area: Marine mammals in area - stay clear |
34 |
Restricted Area: Entry approval required prior to transit |
66 |
Distress Area: Vessel abandoning ship |
98 |
Chart Feature: Semi-submerged object |
|
3 |
Caution Area: Marine mammals in area - report sightings |
35 |
Restricted Area: Entry prohibited |
67 |
Distress Area: Vessel requests medical assistance |
99 |
Chart Feature: Shoal area |
|
4 |
Caution Area: Protected habitat - reduce speed |
36 |
Restricted Area: Active military OPAREA |
68 |
Distress Area: Vessel flooding |
100 |
Chart Feature: Shoal area due north |
|
5 |
Caution Area: Protected habitat - stay clear |
37 |
Restricted Area: Firing - danger area. |
69 |
Distress Area: Vessel fire/explosion |
101 |
Chart Feature: Shoal area due east |
|
6 |
Caution Area: Protected habitat - no fishing or anchoring |
38 |
Restricted Area: Drifting Mines |
70 |
Distress Area: Vessel grounding |
102 |
Chart Feature: Shoal area due south |
|
7 |
Caution Area: Derelicts (drifting objects) |
39 |
(reserved for future use) |
71 |
Distress Area: Vessel collision |
103 |
Chart Feature: Shoal area due west |
|
8 |
Caution Area: Traffic congestion |
40 |
Anchorage Area: Anchorage open |
72 |
Distress Area: Vessel listing/capsizing |
104 |
Chart Feature: Channel obstruction |
|
9 |
Caution Area: Marine event |
41 |
Anchorage Area: Anchorage closed |
73 |
Distress Area: Vessel under assault |
105 |
Chart Feature: Reduced vertical clearance |
|
10 |
Caution Area: Divers down |
42 |
Anchorage Area: Anchoring prohibited |
74 |
Distress Area: Person overboard |
106 |
Chart Feature: Bridge closed |
|
11 |
Caution Area: Swim area |
43 |
Anchorage Area: Deep draft anchorage |
75 |
Distress Area: SAR area |
107 |
Chart Feature: Bridge partially open |
|
12 |
Caution Area: Dredge operations |
44 |
Anchorage Area: Shallow draft anchorage |
76 |
Distress Area: Pollution response area |
108 |
Chart Feature: Bridge fully open |
|
13 |
Caution Area: Survey operations |
45 |
Anchorage Area: Vessel transfer operations |
77 |
(reserved for future use) |
109 |
(reserved for future use) |
|
14 |
Caution Area: Underwater operation |
46 |
(reserved for future use) |
78 |
(reserved for future use) |
110 |
(reserved for future use) |
|
15 |
Caution Area: Seaplane operations |
47 |
(reserved for future use) |
79 |
(reserved for future use) |
111 |
(reserved for future use) |
|
16 |
Caution Area: Fishery - nets in water |
48 |
(reserved for future use) |
80 |
Instruction: Contact VTS at this point/juncture |
112 |
Report from ship: Icing info |
|
17 |
Caution Area: Cluster of fishing vessels |
49 |
(reserved for future use) |
81 |
Instruction: Contact Port Administration at this point/juncture |
113 |
(reserved for future use) |
|
18 |
Caution Area: Fairway closed |
50 |
(reserved for future use) |
82 |
Instruction: Do not proceed beyond this point/juncture |
114 |
Report from ship: Miscellaneous information - define in Asociated text field |
|
19 |
Caution Area: Harbour closed |
51 |
(reserved for future use) |
83 |
Instruction: Await instructions prior to proceeding beyond this point/juncture |
115 |
(reserved for future use) |
|
20 |
Caution Area: Risk (define in Associated text field) |
52 |
(reserved for future use) |
84 |
Proceed to this location - await instructions |
116 |
(reserved for future use) |
|
21 |
Caution Area: Underwater vehicle operation |
53 |
(reserved for future use) |
85 |
Clearance granted - proceed to berth |
117 |
(reserved for future use) |
|
22 |
(reserved for future use) |
54 |
(reserved for future use) |
86 |
(reserved for future use) |
118 |
(reserved for future use) |
|
23 |
Environmental Caution Area: Storm front (line squall) |
55 |
(reserved for future use) |
87 |
(reserved for future use) |
119 |
(reserved for future use) |
|
24 |
Environmental Caution Area: Hazardous sea ice |
56 |
Security Alert - Level 1 |
88 |
Information: Pilot boarding position |
120 |
Route: Recommended route |
|
25 |
Environmental Caution Area: Storm warning (storm cell or line of storms) |
57 |
Security Alert - Level 2 |
89 |
Information: Icebreaker waiting area |
121 |
Route: Alternative route |
|
26 |
Environmental Caution Area: High wind |
58 |
Security Alert - Level 3 |
90 |
Information: Places of refuge |
122 |
Route: Recommended route through ice |
|
27 |
Environmental Caution Area: High waves |
59 |
(reserved for future use) |
91 |
Information: Position of icebreakers |
123 |
(reserved for future use) |
|
28 |
Environmental Caution Area: Restricted visibility (fog, rain, etc) |
60 |
(reserved for future use) |
92 |
Information: Location of response units |
124 |
(reserved for future use) |
|
29 |
Environmental Caution Area: Strong currents |
61 |
(reserved for future use) |
93 |
VTS active target |
125 |
Other - Define in associated text field |
|
30 |
Environmental Caution Area: Heavy icing |
62 |
(reserved for future use) |
94 |
Rouge or suspicious vessel |
126 |
Cancellation - cancel area as identified by Message Linkage ID |
|
31 |
(reserved for future use) |
63 |
(reserved for future use) |
95 |
Vessel requesting non-distress assistance |
127 |
Undefined (default) |