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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: 
EU
Physical link: 
AIS
Message number (0=VDES-VDE): 
8
DAC or VPFI: 
200
FI / Message ID: 
23
State: 
discontinued
Number of slots (max): 
2
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  17Start 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  17End 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