Why don't you use the software serial library?

I have a GPS unit only connected to receive data. Filtering of specific parts of the string is done in
software. Looking for this example I also found this

hi

if you haven't already bought the Parallax module, then you can get a single unit gps module for the same price or less. Polstar (they make the GPS receiver on the Parallax) makes something called the GPS mouse, which has bidirectional serial and an integrated antenna. Garmin and a lot of other people make these too. They all work on standard RS-232 connections, and give out NMEA standard data. Standard GPS units liek the Garmin GPS-12XL will also receive commands and give out NMEA in response.

As people have said above though, it makes sense to just parse it in software.. is there a particular string you are looking for?

D

hi

you should check the update rate for the GPS engine used int he Parallax unit. Most modules are about once per second, although lately I have seen others that are faster. It takes time to triangulate

D