Kongsberg Seatex AIS 100, Инструкция по эксплуатации

Страница: 76 / 113

Seatex AIS 100 Instruction Manual, rev. 5 External interfaces
68
interleaved with the message sentences that, taken collectively,
contain a single message. This field shall be a null field when a
message fits into one sentence.
NOTE 3 This is the channel used to broadcast the AIS message. The AIS
channel field, set to either "A" or "B", indicates that the message was
broadcast. If the message is not broadcast, the "AIS Channel" field
shall be null. The VHF channel numbers for channels "A" and "B" are
obtained by using an ACA-sentence "query" of the AIS.
NOTE 4 The maximum string length of encapsulation is limited such that the
total number of sentence characters does not exceed 82. This field
supports a maximum of 62 valid characters for a message transferred
using multiple sentences, and 63 valid characters for a message using
a single sentence.
NOTE 5 To encapsulate, the number of binary bits must be a multiple of six. If
it is not, one to five "fill bits" are added. This parameter indicates the
number of bits that were added to the last 6-bit coded character. This
value shall be set to zero when no "fill bits" have been added. This
cannot be a null field.
VSD – Voyage Static Data
This sentence is used to enter information about a ship's voyage. This
information remains relatively static during the voyage. However, the
information will frequently change from voyage to voyage. The
parameters in this sentence support a number of the ITU-R M.1371
messages.
NOTE 1 Type of ship and cargo category are defined in ITU-R M.1371. The
description of ship and cargo are indicated by a number. The values
are defined in ITU-R M.1371, message 5. A null field indicates that
this is unchanged.