Area notice

Introduction/Additional information: 

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.

 

Registrant: 
IMO Circ. 289
Message number: 
6
DAC: 
1
FI: 
23
State: 
in force
Number of slots (max): 
5
Permitted as from: 
04/03/2011
Details: 

Table 11.2

Area notice - Addressed

 

Parameter

No of bits

Description

Standard Message Header

Message ID

6

Set to 6 (addressed, acknowledgement required).

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.

Sequence number

2

Refer to ITU-R M.1371-3, Annex 2, § 5.3.1

0 - 3

Destination MMSI

30

MMSI number of destination station.

Retransmit Flag

1

Retransmit Flag should be set upon retransmission.

0 = no retransmission = default

1 = retransmitted

Spare

1

Not used.  Set to zero.

Binary Data

Designated Area Code

10

DAC = 001

Function Identifier

6

FI = 23

Application Data

Message Linkage ID

10

Binary identifier for the defined area. This number uniquely identifies an Area and is used to link additional information with the Area. Source MMSI and this ID uniquely identify the zone. The number is unique across all binary messages to which Message Linkage ID applies.
Set to 0-1,023 by message originator.

Notice Description

7

Notice Description as defined in Table 11.11.
Set to 0-127 according to description. If = 127 there must be associated text (Table 11.10)

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 end of Area notice. Measured from start date and time of Area Notice.
0 = cancel Area Notice

262,143 = undefined = default
Maximum duration is 262,142 minutes (182.04 days).

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 1,013

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.
Set 0 for Circle.

Scale Factor

2

Scale factor. This is a multiplier for the dimensions of the shape.
1 (default), 10, 100, & 1,000 (scale factor = 10n where n=decimal value of scale factor).

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. 
0 = point (default)

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.
Set 1 for Rectangle.

Scale Factor

2

Scale factor. This is a multiplier for the dimensions of the shape.
1 (default), 10, 100, & 1,000 (scale factor = 10n where n=decimal value of scale factor).

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.
0 = no rotation = default

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.
1 (default), 10, 100, & 1,000 (scale factor = 10n where n=decimal value of scale factor)

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

 

Table 11.8

Waypoint/polyline points

 

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.
1 (default), 10, 100, & 1,000 (scale factor = 10n where n=decimal value of scale factor)

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.
Degrees bearing = decimal value (0-719)*.5

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.
Degrees bearing = decimal value (0 - 719)*.5

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.
Degrees bearing = decimal value (0-719)*.5

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.
Degrees bearing = decimal value (0 - 719)*.5

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))

nid%3D43%7Ctitle%3Dgraph_desc%7Cdesc%3D%7Clink%3Dnone

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

Table 11.9

Polygon

 

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.
1 (default), 10, 100, & 1,000 (scale factor = 10n where n=decimal value of scale factor)

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.
Degrees bearing = decimal value (0 - 719)*.5

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.
Degrees bearing = decimal value (0 - 719)*.5

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.
Degrees bearing = decimal value (0-719)*.5

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.
Degrees bearing = decimal value (0-719)*.5

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)