How long is the validity of a Certificate of Instrument Registration (CIR) for a GNSS Receiver?

• A. One year
• B. Two years
• C. Three years
• D. Four years

Answer: (B)

Two years is the period during which a GNSS receiver’s Certificate of Instrument Registration remains in force. This two-year window is chosen to balance regulatory oversight with practical administration: it ensures the device continues to meet the required standards and keeps records up to date without excessively frequent renewals. After this period, the CIR must be renewed to maintain legal operation, typically by submitting current device details, any necessary documentation, and paying the renewal fee. A shorter window like one year would mean unnecessary administrative burden, while longer windows such as three or four years could allow outdated or noncompliant devices to operate without timely review.