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FLUGPROP 546 is receiving their departure clearance which requires the use of GNSS, which the crew cannot accept. What is the correct response to the clearance "Cleared via ODEMI SIX VICTOR departure, squawk 1046"?
(callsigns are omitted)
  • A
    Negative ODEMI SIX VICTOR due RNAV type, squawk 1046.
  • B
    Unable RNAV.
  • C
    Unable ODEMI SIX VICTOR due RNAV type.
  • D
    Negative RNAV, squawk 1046.

Refer to figure.
RNAV arrival or departure procedure cannot be accepted by the pilot ⇒ "UNABLE (designator) DEPARTURE [or ARRIVAL] DUE RNAV TYPE.

ICAO Doc 4444
Chapter 10. PHRASEOLOGY
(P-ATM – Chapter 12)

10.1 RNAV
10.1.1 In the ICAO MID Region, the phrase “UNABLE RNAV DUE EQUIPMENT” shall be included by the pilot immediately following the aircraft call sign whenever initial contact on an ATC frequency is established by an aircraft experiencing a failure or degradation of the RNAV system.

10.1.2 In the ICAO MID Region, the phrase “NEGATIVE RNAV” shall be included by the pilot immediately following the aircraft call sign whenever initial contact on an ATC frequency is established by a State aircraft not equipped with RNAV.

European Region Area Navigation (RNAV) Guidance Material
6.3 RNAV Phraseology

6.3.1 The RTF phraseology for use by State aircraft, not equipped with RNAV, should be understood in the context of the mandatory nature of the B-RNAV equipment. As such, State aircraft, not equipped for B-RNAV operations, but having a navigation accuracy meeting RNP5, do require special handling by ATC, and therefore all include the following phrase whenever initial contact on an ATC frequency is established:

(aircraft callsign) NEGATIVE-RNAV

6.3.5 If a RNAV arrival or departure procedure, which has been assigned cannot be accepted by the pilot, for reasons of either the RNAV equipment or circumstances associated with its operational use, the pilot shall inform ATC immediately by use of the phrase:

UNABLE (designator) DEPARTURE [or ARRIVAL] DUE RNAV TYPE

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