Navman 11 User Manual

54

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

Message ID: ZCH
Rate: variable; defaults to 1 Hz
Fields: 24

$__ __ZCH

Start of sentence and address field

$PRWIZCH

1-2

SAT_PRN

Channel 1 satellite PRN number (Note 1)

xx

05

2

STATUS

Channel 1 status indication (Note 1)

hh --

F

3-4

...

Channel 2 satellite PRN number and status indication

xx,hh- -

...

5-6

...

Channel 3 satellite PRN number and status indication

xx,hh- -

...

7-8

...

Channel 4 satellite PRN number and status indication

xx,hh- -

...

9-10

...

Channel 5 satellite PRN number and status indication

xx,hh- -

...

11-12

...

Channel 6 satellite PRN number and status indication

xx,hh- -

...

13-14

...

Channel 7 satellite PRN number and status indication

xx,hh- -

...

15-16

...

Channel 8 satellite PRN number and status indication

xx,hh- -

...

17-18

...

Channel 9 satellite PRN number and status indication

xx,hh- -

...

19-20

...

Channel 10 satellite PRN number and status indication

xx,hh- -

...

21-22

...

Channel 11 satellite PRN number and status indication

xx,hh- -

...

23-24

...

Channel 12 satellite PRN number and status indication

xx,hh- -

...

CKSUM

Checksum

*hh

*37

<CR><LF>

Sentence terminator

Note 1: Channel number (xx) is implied by position in message. Data for all 12 channels is always provided in this message. If a 

channel is unused, a value of 0 will appear for both channel fields. The status indication (hh__ is a one-digit, hexadecimal value 

which represents four bits as follows:

 <y.O> Measurement of the satellite on this channel used in navigation solution.

 <y.1> Ephemeris available for the satellite on this channel.

 <y.2> Satellite on this channel is in track.

 <y.3> DGPS corrections available for the satellite on this channel (Note: This bit will never be set whenever the configuration of a 

particular Jupiter GPS receiver does not support DGPS).

This message complements the GSV message by 

providing satellite-to-channel mapping and a status 

indication for each channel. The contents of the 

‘ZCH’ message are described in Table 3-53. 

Sample message:
$PRWIZCH,05,F,20,F,04,F,09,F,16,F,06,F,07,6,

00,0,24,F,00,0,00,0,00,0*37