Position Report Payload

Introduction/Additional information: 

The EAIS Position Report Payload format is intended to mirror ITU-R M.1371-5 Message 1 Position Reports format. The table contained here is informational. Implementers should refer back to ITU-R M.1371-[current revision] for most up to date bit usage and descriptions. The EAIS Position Report Payload prior to encryption without bit stuffing is 184 bits in length. Conforming to the AES Encryption scheme with a 128-bit cipher key, the encrypted part of the payload then effectively becomes 256 bits in length to create blocks of 128 bits. The FID 56 position report shall be transmitted once every 30 seconds when the unit has registered a speed over ground (SOG) of less than 3 knots for more than 3 minutes and once every 15 seconds when SOG is 3 knots or greater.

Permitted as from: 
04/06/2014
Not to be used after: 
20/04/2017
Registrant: 
USCG
Message number: 
8
DAC: 
366
FI: 
56
State: 
deprecated
Number of slots (max): 
3
Last modified: 
20210129T231907