Navman 11 - Manual (Page 24)

24 MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.
Message ID: 1108
Rate: 1 Hz
Message length: 20 words
Word No. Name Type Units Range Resolution
1-4 Message header
5 Header checksum
6-7 Set time (Note 1) UDI 10 ms ticks 0 to 4 294 967 295
8 Sequence number (Note 2) I 0 to 32 767
UTC time
9-13 Reserved
14-15 UTC Seconds Of Week UDI s 0 to 604 799 1 s
16
GPS to UTC time offset (integer
part)
I s –32 768 to +32 767 1 s
17-18
GPS to UTC time offset (fractional
part)
UDI ns 0 to 999 999 999 1 ns
UTC time validity (19.0-19.15)
19.0 Time mark validity Bit 1 = true
19.1 GPS/UTC sync Bit
0 = GPS
1 = UTC
19.2-19.15 Reserved
20 Data checksum
Note 1: Set time is an internal 10 millisecond (T10) count since power-on initialisation enabled the processor interrupts. It is not used
to derive GPS time, but only serves to provide a sequence of events knowledge. The set time or T10 count references the receiver’s
internal time at which the message was created for output. The T10 range is approximately 71 weeks.
Note 2: The sequence number is a count that indicates whether the data in a particular binary message has been updated or
changed since the last message output.
Table 3-14 Message 1108 (UTC time mark pulse output)
3.5.1.10 Message 1108 (UTC time mark pulse output)
This message provides the UTC seconds into
week associated with the UTC synchronised time
mark pulse. This message is output approximately
400 milliseconds before the time mark pulse strobe
signal. The contents of the ‘UTC time mark pulse
output’ message are described in Table 3-14.