Your message is not very easy to understand: if you are a 3rd party GPS that works only with default airports, it won't work with addon airports, but that can't obviously be a problem of the addon airport so, why asking here ?
If this wasn't what you meant, please clarify better.
Tks, i thought i have been understood
The problem is that ater uninstalled O'hare fsdt , the 3rd party (DBs-gps ) should work because the aiport is the default kord