Hi Don,
Currently, disabling the GPS location icon on the iFly devices is not possible. Now, if you are using a tablet like an iPad or Android, you can turn off the GPS location services. It will then show a banner for No GPS Lock, but there will be an icon at the last known location. So you might want to turn it off away from the airport or flight area.
It's actually an interesting feature idea. I'll pass it along here at the office. It could be a EFB Chart Viewer Mode, basically "No GPS Tracking". I could see an opportunity for Flight Schools or applications where GPS tracking is not allowed. Thanks for the great questions and feedback.