Navman 11 User Manual

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

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

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

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.

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.