On Jun 27, 2006, at 8:30 PM, Jesse Welling wrote:



a 1Hz update rate would probably be enough, even so I'll be using a 4Hz GPS 
unit.


I'd like to hear more about this GPS.....or at least a part number and where 
you got it.
Thanks and good luck!

The LEA-4H which is on the GPSstix can do 4Hz updates via NMEA.  You can set the update speed per message, using:

PUBX 40 - Set NMEA message output rate

$PUBX,40,msg_id,rus0,rus1,rus2,reserved*cs<CR><LF>
Name
ASCII String
Units
Description
Format
Example
$PUBX
string
$PUBX

 

Message ID
Proprietary NMEA sentence header
40
numeric

 

 

 

Proprietary message identifier of the msg to configure
msg_id
string
GLL

 

 

NMEA message identifier
rus0
numeric
1

 

# cycles
output rate on USART 0.
  • 0 disables that message from being output
  • 1 means that this message is output with every Navigation
rus1
numeric
0

 

# cycles
output rate on USART 1
rus2
numeric
0

 

# cycles
output rate on USART 2
reserved
numeric
0

 

 

Reserved. Always fill with 0.
cs
hexadecimal
*5D

 

checksum
Message checksum in hexadecimal
<CR> <LF>

 

 

 

 

End of message

Example

$PUBX,40,GLL,1,0,0,0*5D<CR><LF>