Zeroizing which data will greatly impair mission system accuracy?

• A. P Codes
• B. K Keys
• C. Crypto Seed
• D. C Codes

Answer: (A)

The data that most directly determines how accurately the mission system can determine its position and timing is the precise navigation data used to form pseudorange measurements. P Codes carry the high-precision ranging information essential for accurate position fixes and robust navigation performance. If these codes are zeroized, the receiver loses the ability to form accurate pseudorange measurements, causing large errors in the computed position and timing—the kind of impairment that severely degrades mission accuracy.

The other items are tied to security and access rather than the core measurement math. K keys and C codes are cryptographic or access-control materials, so removing them would block decryption or authentication, but it doesn’t directly wipe out the fundamental ranging measurements. The crypto seed is likewise about cryptographic initialization, not the measurement process itself. So, while those would disrupt security or operation in different ways, they don’t impair accuracy as profoundly as losing the P Codes.