S, sorry for the delay in responding.  It sounds like your internal database has been corrupt.  Try creating an update package that has only the Airport & Navaid database, plug in the USB stick to your iFly while powered off, then plug in your iFly.  You should be prompted to install the package; when done your unit should function normally again.  If this doesn't correct the problem contact our support for a new SD card.
Thanks,
Walter