24MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.Message ID: 1108Rate: 1 HzMessage length: 20 wordsWord No. Name Type Units Range Resolution1-4 Message header5 Header checksum6-7 Set time (Note 1) UDI 10 ms ticks 0 to 4 294 967 2958 Sequence number (Note 2) I 0 to 32 767UTC time9-13 Reserved14-15 UTC Seconds Of Week UDI s 0 to 604 799 1 s16 GPS to UTC time offset (integerpart) I s –32 768 to +32 767 1 s17-18 GPS to UTC time offset (fractionalpart) UDI ns 0 to 999 999 999 1 nsUTC time validity (19.0-19.15)19.0 Time mark validity Bit 1 = true19.1 GPS/UTC sync Bit 0 = GPS1 = UTC19.2-19.15 Reserved20 Data checksumNote 1: Set time is an internal 10 millisecond (T10) count since power-on initialisation enabled the processor interrupts. It is not usedto derive GPS time, but only serves to provide a sequence of events knowledge. The set time or T10 count references the receiver’sinternal 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 orchanged 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 intoweek associated with the UTC synchronised timemark pulse. This message is output approximately400 milliseconds before the time mark pulse strobesignal. The contents of the ‘UTC time mark pulseoutput’ message are described in Table 3-14.
