[gpsd-dev] New 0.5 draft of the SemPiTernal HOWTO

[Gary E. Miller]

Yo Frank!

On Thu, 5 May 2016 19:49:28 -0400
Frank Nicholas <frank at nicholasfamilycentral.com> wrote:

> We want to use PGGA sentence because it appears first, closest to
> the start of the second in each cycle.
> 
> You have mode set to 17, using message GPRMC.  Can someone who knows
> more than me, explain to me if it really matters?

NMEA sentences are vaiable length.  So you want to use the first one
to cut jitter on the NMEA time.  In practice you have the PPS, 10,000
times more accurate, so never a problem unless you lose PPS.

> Regarding the 9600 baud, in another thread Gary Miller says we should
> up the baud rate higher than 9600.  Maybe he can reply with a
> recommendation for this.

Some GPS can barely get all their sentences out every second at 9600.
If you have a lot of sats in view, or optional NMEA turned on, your
buffers may overflow.


RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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