Incidentally, I completely agree with Alan and should have pointed that out as well. In fact, I ran into trouble because the copy of NMEA I have is a few years old (2.1) and the manufacturer deviated from what was written in that standard. When I referenced their manual, cleaned up the difficulties, all was happy, happy again. I think NMEA is up to V3.x now and perhaps this later addition has also changed parameters for some message formatters.

Cheers,
Kevin

On 20/02/02 at 9:14 AM Alan B. Pearce wrote:

>>Next, depends on your engine manufacture. Generally speaking they all
>>support or conform to NMEA-0183 (check out www.nmea.org). These are
>>simple serial commands that can use most UART's on for example a PIC (to
>>keep the PIC flavour). Most manufacturers also offer faster port access
>>via propriatary interfaces. For those you'll reference each manufacturer.
>
>You will probably find that you need to pay a reasonable fee to get a copy
>of the standard from the NMEA. It is easier (and a lot cheaper) to download
>manuals from some of the GPS engine manufacturers like Garmin
>(http://www.garmin.com/support/userManual.html) which also has a GPS Guide
>for Beginners, or Trimble (http://www.trimble.com/gps/). These manuals show
>the messages and formats that are sent from the engines they produce
>without
>going to the expense of getting the full standard from NMEA.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu