Navman 11 User Manual

31

MN002000A © 2004 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.

Message ID: 1160
Rate: variable
Message length: 270 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

Table frequency offset (Note 3)

I

ppm

0 to ±51

0.15

10.0

Table frequency offset valid (Note 4)

bit

1 = valid

10.1-10.15

Reserved

11

Offset error estimate (Note 5)

I

ppm

0 to ±51

0.002

12

Aging rate estimate (Note 6)

I

ppm/yr

0 to ±5

0.0002

13

Last rate update week (Note 7)

I

weeks

0 to 32 767

1

14-269

Frequency standard table (Note 8): LSB, 

MSB

I

weeks

ppm

0 to 1023

0 to ±19.05

4

0.15

270

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.

Note 3: Each value of frequency error in the table shares this common offset value.

Note 4: Flag to indicate that the offset has been established.

Note 5: Filtered estimate of accumulated error in the table offset value.

Note 6: Filtered estimate of the current aging rate.

Note 7: Whole week number of the last update of the aging rate.

Note 8: LSB = the approximate time of last table entry update. MSB = the frequency error at each table temperature, less the table 

offset.

This message contains parameters and table 

data used in the receiver’s frequency standard 

compensation model. It is intended that this 

message will be used in conjunction with Message 

1360 to retrieve and restore this information for 

external storage. The contents of the ‘frequency 

standard table output data’ message are described 

in Table 3-20.