Yes, indeed, at http://tracking.rowi.net you see my APRS-Signals from my car. I decided against using the empeg for it because with Tinytrak (http://www.byonics.com/tinytrak/) you can accomplish the same even with low budget.
The Tinytrak has a serial passthru so you can connect GPSapp to it. This works fine for me.
With an optional Y-Cable you can grab the serial signal for e.g. a Pocket PC, as I do. The current is enough for splitting the output of the serial port of the Tinytrak to feed two devices. This is ok because you have a one-way-connection (unless you want to program the GPS-mouse).

You can see all this and now tuner installing included at the next Amersfoort meet. There will be no hidden cables because I do compete again ;-).

Rolf