let me answer this before someone comes in here and gives you a hard time for not reading the other threads, as tends to happen frequently. go into the external apps section and add iGuidance (or iGmod, which is easier to use in CF), i.e. the path, window name, etc. use a name other than "GPS" to help avoid some of the confusion of having two "GPS" apps. you can rename it later if you so desire. save it and then go to "set actions". scroll down to "Global Button 4 (GPS)", click on that, scroll through the list of actions that it brings up and find the name you gave iGuidance earlier. click on that, save it, check to see that the name changed on the button itself and you should be set to go. send me a PM if you have any questions.