Mark Kelly wrote:
> Very interesting, I have about a half dozen of the GPS18's in the serial
> version and they all work the way as I described.  I can't believe they
> would lock down only the USB versions to use a proprietary protocol. 
> 
> Did you try to use sirfmon on a pc to see if it would put it in NMEA
> mode?  It seems like Garmin has a winders application that's free that
> will also switch the device to NMEA output.

I do not know that application, but the garmin communication spec
(available from the garmin web site) does not have any way to set
the output mode.

>From what I know, garmin USB devices do not support NMEA.  They
support either the garmin propitiatory protocol (and are garmin
propitiatory USB devices, not serial devices), or are USB mass
storage devices and use .gpx files.

The Linux driver garmin_gps emulates a USB serial device so that
legacy (serial) applications can connect to the garmin propitiatory
USB device.
 
-Geoff

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