What is the track quality of a J3.4 message?

What is the track quality of a J3.4 message?

• A. Zero
• B. Low
• C. Medium
• D. Unknown

Answer: (A)

Track quality shows how confident the system is in the reported track data. For a J3.4 message, the specification assigns a track quality of zero, meaning there is no explicit reliability information accompanying the track data in that message. In other words, J3.4 provides track updates without a qualitative confidence value, so the track quality is effectively not rated or not provided. The higher quality levels (low, medium, etc.) come from other message types that include a reliability field; those do not apply to this J-series message, which is why zero is the correct representation.

Track quality shows how confident the system is in the reported track data. For a J3.4 message, the specification assigns a track quality of zero, meaning there is no explicit reliability information accompanying the track data in that message. In other words, J3.4 provides track updates without a qualitative confidence value, so the track quality is effectively not rated or not provided. The higher quality levels (low, medium, etc.) come from other message types that include a reliability field; those do not apply to this J-series message, which is why zero is the correct representation.