EMMA warning

Introduction/Additional information:

The EMMA warning shall be used to warn shippers using graphical symbols on the ECDIS screen of heavy weather conditions. The following message is capable of transmitting the EMMA data using the AIS channel. It will not replace the Notices to Skippers warnings.

This message should be sent by base stations only, to give weather warnings to all vessels in a certain area. The message should be sent with binary message 8 on demand.

Permitted as from:

10/10/2007

Registrant:

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

200

FI / Message ID:

State:

discontinued

Number of slots (max):

Last modified:

29/01/2021 - 23:18

Details:

Parameter	Bit	Description
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. Default = 0; 3 = do not repeat any more
Source ID	30	MMSI number
Spare	2	Not used, should be set to zero. Reserved for future use.
Application Identifier	16	As described in Table 2,6
Start date	17	Start of validity period (YYYYMMDD), Bits 18-10: year since 2000 1-255 0 = default) Bits 9-6: month (1-12 0 = default) Bits 5-1: day (1-31 0 = default)
End date	17	End of validity period (YYYYMMDD), Bits 18-10: year since 2000 1-255 0 = default) Bits 9-6: month (1-12 0 = default) Bits 5-1: day (1-31 0 = default)
Start time	11	Start time of validity period (HHMM) UTC Bits 11-7: hour (0-23 24 = default) Bits 6-1: minute (0-59 60 = default)
End time	11	End time of validity period (HHMM) UTC Bits 11-7: hour (0-23 24 = default) Bits 6-1: minute (0-59 60 = default)
Start longitude	28	Begin of the fairway section
Start latitude	27	Begin of the fairway section
End longitude	28	End of the fairway section
End latitude	27	End of the fairway section
Type	4	type of weather warning: 0 = default/unknown, others see ANNEX B: EMMA CODES Table B.1
Min value	9	Bit 0: 0 = positive, 1 = negative value = default Bits 1 - 8 = value (0 - 253 254 = 254 or greater, 255 = unknown = default)
Max value	9	Bit 0: 0 = positive, 1 = negative value = default Bits 1 - 8 = value (0 - 253 254 = 254 or greater, 255 = unknown = default)
Classification	2	classification of warning (0 = unknown/default, 1 = slight, 2 = medium, 3 = strong/heavy) according to ANNEX B: EMMA CODESTable B.2
Wind direction	4	direction of wind: 0 = default/unknown, others see ANNEX B: EMMA CODESAnnex B Table B.3
Spare	6	not used, should be set to zero. Reserved for future use.
	256	occupies 2 slots

Table 2.12: Weather type code

Code	Description (EN)	AIS
WI	Wind	1
RA	Rain	2
SN	Snow and ice	3
TH	Thunderstorm	4
FO	Fog	5
LT	Low temperature	6
HT	High temperature	7
FL	Flood	8
FI	Fire in the forests	9

Table 2.13: Weather category type code

Code	Description (EN)	AIS
1	Slight	1
2	Medium	2
3	strong, heavy	3

Table 2.14: Wind direction code

Code	Description (EN)	AIS
N	North	1
NE	North east	2
E	East	3
SE	South east	4
S	South	5
SW	South west	6
W	West	7
NW	North west	8