I have a Rosen Navagation unit installed in a Santa Fe that has issues with touchscreen calibration that may also affect Prius Rosen units. My Rosen model number ends in P11, just like latest Rosen nav unit used in the Prius. Unfortunately for me, I cannot find any other Rosen users in the Hyundai forums. Fortunately for me, there seems to be a lot of them here in the Prius forum. So, let's see if we can help each other out with a problem you may also have, but not be aware of. I am trying to find out if it is a system-wide software bug, or an isolated issue. Read on. 1. First, go to the Radio mode, touch Menu, Settings and touch the greyed out Keypad in the upper right corner of the screen. A keypad will appear. Enter 7253 and press Enter. The installer settings will appear. Set the RDS switch to ON, or RBDS, if it is not already set. This sets your FM radio to display the Song Title and Artist on stations that broadcast RDS (USA stations). To check RDS, exit the Settings menu and go to an FM station and see if the title and artist of the song appears on the screen. If not, check other stations, not all broadcast RDS data. Once you see that you are getting RDS, go to the next step. 2. Next, check if your touchscreen is calibrated. It is easiest to see screen calibration on the Phone screen. Use a blunt pointed object, like a toothpick, to touch the phone dialpad buttons to see if they react exactly as they are displayed. If you find that you can touch between the buttons and still get a response from an adjacent button, or worse yet, the edge of one button activates the adjacent button, then your touchscreen is out of calibration. See the attached picture for an example of an out of calibration touchscreen. If it is out, go to the Main Menu and look for a Touch setting. Follow the on-screen instructions to touch each â€œ+â€ until you have calibrated the screen. 3. Go back to the Phone screen and test calibration again. It should be much better. 4. Turn the ignition switch to OFF to fully power down the Rosen. Then turn it back to ACC to power it back on. Did RDS information disappear from the FM radio screen? If so, you have the problem. Turn RDS back on per Step 1 above, then power the radio OFF and ON again with the ignition switch. Check your touchscreen calibration per step 2 above. Did it go out? The software bug is simply stated as: Calibrating the touchscreen causes RDS to turn off after turning the unit OFF and ON. Turning RDS back on causes the touchscreen to go out of calibration after turning the unit OFF and ON. That concludes part one of the test. Please post your results. If I get responses here, I will post how to test your navigation touchscreen calibration. It is most likely a lot further off than the audio screens were, and will create problems particularly when you use the keyboard to enter addresses. The test I will post will demonstrate if you have a software bug that loses Nav touchscreen calibration.