With RAIM, the enroute/terminal CDI sensitivity can be reduced to what value?

• A. +/- 2 NM
• B. +/- 5 NM
• C. +/- 1 NM
• D. +/- 3 NM

Answer: (A)

RAIM gives you confidence in GPS integrity by continually checking satellite signals and excluding faulty data. When RAIM is available and functioning, you can rely on GPS lateral accuracy to be within a 2 nautical mile tolerance for enroute and terminal phases. That means the CDI can be set to a ±2 NM sensitivity, providing a tighter and more trustworthy representation of your position relative to the desired course. The other options would either be looser tolerances or not reflect the RAIM-enabled level of integrity, which is why ±2 NM is the correct setting.