Navman 11 User Manual

46

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

Message ID: 1351
Rate: As required. The maximum allowable rate is once every 100 ms (Note 1)
Message Length: Varies with message

1-4

Message header

5

Header checksum

6

Sequence number (Note 2)

I

0 to 32 767

7 to n-1

Any valid RTCM-104 raw data in multiples of 16 bits, not to exceed 32 16-bit words (Note 3)

n

Data checksum (Note 1)

Note 1: ‘n’ must be less than or equal to 39. No more than 32 receiver 16-bit words of RTCM data should be delivered to the receiver 

with anyone message. Word description, number of words, header 4, header checksum 1, reserved (sequence number) 1, RTCM 

data <32, data checksum 1------ (max number of words <39).

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 input.

Note 3: Raw demodulated data must conform to the ‘6 of 8’ format described in the RTCM SC-1 04 standard. The data must also 

be packed into one or more 16-bit words and should be ordered chronologically from earliest to latest. Specifically, Word 7 should 

represent the earliest data and Word n-1 should represent the latest.

 Within each word, the most significant bit (bit 15) should represent the latest received bit and the least significant bit (bit 0) should 

represent the earliest received bit. (Note that according to RTCM ‘6 of 8’ format, bits 6 and 14 should be set marking (1) and bits 7 

and 15 should be set spacing (0) for each word.) The intent of this bit ordering is to allow the user to pass on the raw RTCM data 

without modification.

This input message contains DGPS RTCM SC-l04 

data. The message is provided for backwards 

compatibility with the earlier MicroTracker GPS 

receiver and may be used in lieu of the auxiliary 

port data. The contents of the ‘raw DGPS RTCM 

SC-l04 data’ message are described in Table 3-41.