[aprssig] GPS recommendation

[Rich Mulvey]

Amir's email wrote:

>Now there may be USB to serial converters out there. My experience with the
>serial to USB converters shows that not all are equal and not all work with
>all applications... So this may not be the way to go, unless you like being
>a trailblazer.
>
>  
>

   A USB->Serial converter won't work.  They require that the USB end of 
the cable be a USB Host device.  None of the USB GPS's out there act as 
anything other than USB clients.

- Rich