The alert 'LS1A GPS CODE INVALID' informs the operator that

The alert 'LS1A GPS CODE INVALID' informs the operator that

• A. GPS satellites are offline
• B. The map database is corrupt
• C. The DAGR COMSEC needs to be loaded/reloaded
• D. The system is overheating

Answer: (C)

The key idea here is that the DAGR’s GPS signals include encrypted codes that can only be decoded with cryptographic keys. When those COMSEC keys aren’t loaded or have become invalid, the receiver cannot verify the GPS code, so it flags a CODE INVALID condition. That’s a security/key-management issue, not a problem with satellites, the map data, or the device’s temperature. The correct action is to load or reload the COMSEC keys in the DAGR so the encrypted GPS code can be properly authenticated.

The key idea here is that the DAGR’s GPS signals include encrypted codes that can only be decoded with cryptographic keys. When those COMSEC keys aren’t loaded or have become invalid, the receiver cannot verify the GPS code, so it flags a CODE INVALID condition. That’s a security/key-management issue, not a problem with satellites, the map data, or the device’s temperature. The correct action is to load or reload the COMSEC keys in the DAGR so the encrypted GPS code can be properly authenticated.