Benefits of a ClearGuardXP screen protector:

• Will prevent scratches and marks
  
• Crystal Clear and Razor thin
• Will not interfere with the functionality of the screen
• Can be removed and reapplied

Car navigation screens are becoming more and more common, especially on newer and more expensive cars. Many makes and models have touch screen navigation systems, however these are easily prone to scratching and marking. You can easily save yourself the trouble of scratches or even replacing the screen with a screen protector. Even if your screen is not touch sensitive, it will still be prone to dust and glare. With a ClearGuardXP navigation screen protector, you can easily protect your valuable investment.

ClearGuardXP pioneered this protective technology and there may be many knock-offs, so make sure that you get the original ones.
They can be found here ClearGuard XP Screen Protectors.