According to a guide to using the Florida Permanent Reference Network, the following rules should be observed:

• As a General guideline when using a Real-Time Reference Network when within 12
  kilometers or 7 miles of a reference station you should use the single baseline correction
• If outside the 12km range you should use one of the Network solutions
• Finally, when using Real-Time corrections, whether single baseline or network solution, you
  should “localize” to known control

I assume this could be used as a general guideline when using any reference network. I'm confused about the third rule. If you're fixed (vs. autonomous), aren't you using real-time corrections? We work using a fixed solution only. What if there isn't any known control available to "localize" to?