#### Manufacturer Messages Transmitted by DDCS

The **PNAVRIS** message is an extension of the IEC 61162 protocol developed by the manufacturer for transmitting navigation data (position, course, speed) from a VHF radio station supporting {doc}`DDCS </sections/sensors/dcs/index>` to ECDIS.

**PNAVRIS message format:**

```{code-block} text
$PNAVRIS,xxxxxxxxx,llll.ll,a,yyyyy.yy,a,hhmm,ddmmyy,x.x,x.x,xx,*hh<CR><LF>
    1       2         3    4    5     6   7    8     9   0  11     12            
```

##### Message Fields

| No. | Field | Description |
|---|------|----------|
| 1 | Message identifier | $PNAVRIS |
| 2 | RMPS | River mobile service identifier |
| 3 | Latitude | Latitude coordinate |
| 4 | N/S | Latitude direction (north/south) |
| 5 | Longitude | Longitude coordinate |
| 6 | E/W | Longitude direction (east/west) |
| 7 | Time | Time in hhmm format |
| 8 | Date | Date in ddmmyy format |
| 9 | Course Over Ground (COG) | Course over ground |
| 10 | Speed Over Ground (SOG) | Speed over ground |
| 11 | Radio station channel number | VHF radio station channel number |
| 12 | Checksum
|    | \<CR\>\<LF\> | Checksum and end-of-line characters |
