[aprssig] GPS upgrade

[Dale Blanchard]

Greg D. wrote:
> Besides NMEA in/out, be sure that the unit has a SERIAL port, not USB, 
> if you want to attach it directly to a TNC.  Many GPS now come with USB 
> interfaces, and only a few have the old style serial ports.
> 
> Greg  KO6TH.
The problem is finding out which has which.
The snake oil marketing does not realy tell much.
I takes a long time to search out the truth.
Dale