All GPS (0183 standard) units should output at 4800 - that's specified in
the standard, (and you could get a manufacture to up but, without wanting to
should pedantic - then it would not be the 0183 standard).

There is a revision of the 0183 (well, it's more of a complete rewrite)
called the NMEA 2000, which rather than using a serial transmission method
is based around what appears to be the OSI 7 Layer Model (or TCP/IP haven't
worked it out yet). And than can do up 1.5Mbit a second (AFAIK!) with a
range of transmission speeds up to that. But the 'old' 183 is still there,
And will be for years.




-----Original Message-----
From: Russell McMahon [mailto:apptech@PARADISE.NET.NZ]
Sent: 15 December 2002 02:21
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Old GPS thread...

AFAIK all "normal" GPS's output at 4800 baud.
No doubt you could get manufacturers to use another data rate if you were
buying a moderate amount.

At 4800 baud a typical collection of output "sentences occupies about half a
second (around 250 bytes). If you were wanting a slower baud rate (unlikely)
you'd need to select what sentences were sent each time.

        RM


> I dug up this old posting because I just read in the NMEA 0138 standard
that
> 4800 baud is Max. Is the document I'm reading out of date? any experts out
> there today?

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