Thank you chiefs !
I've found something interesting in the AFM :
4. Provided a Garmin G1000 GPS receiver is receiving adequate usable signals, it has
been demonstrated capable of and has been shown to meet the accuracy specifications
for:
(a) VFR/IFR enroute, oceanic, terminal, and non-precision instrument approach (GPS,
Loran-C, VOR, VOR-DME, TACAN, NDB, NDB-DME, RNAV) operation within the
U.S. National Airspace System in accordance with AC 20-138A.
(b) RNAV (GPS) Approaches - The G1000 GPS meets the requirements of AC
20-138(A) for GPS based RNAV approaches. This includes RNAV approaches
labeled as RNAV (GPS), provided GPS sensor data is valid.
(c) The systems meets RNP5 airspace (BRNAV) requirements of AC 90-96 and in
accordance with AC 20-138A, EASA AMC 20-4, and FAA Order 8110.60 for oceanic
and remote airspace operations, provided it is receiving usable navigation
information from the GPS receiver.
Navigation is accomplished using the WGS-84 (NAD-83) coordinate reference datum.
GPS navigation data is based upon use of only the GPS operated by the United States
of America.
I'm currently fling this aircraft . You send me the supplement A33 to the airplane flight manual for DA42 NG . I've read that for this version the garmin is PRNAV approved. I'll try to find the supplement for the classic version.
You asked me about my school's LOA, but nothing about the garmin 1000 certification or Rnav operation is in it . I guess they'll have to work on it and tomorrow i'll find the head of IFR department.
thank you and i'll keep you advised