APPX. 6 DIGITAL INTERFACE
AP-37
SMB: IMO SafetyNet Message Body
SRP: System function ID resolution protocol
See SRP in input section.
Proprietary sentences
PFEC rmset, PFEC rminf, PFEC rmalr.
$**SMB,xxx.xxx,x,x.x,c---c*hh<CR><LF>
1 2 3 4 5
1. Total number of sentences needed to transfer the message, 001 to 999
2. Sentence number, 001 to 999
3. Sequential message identifier, 0 to 9
4. Unique message number
5. Message body
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