Clue 6: Navire noir perche is dirigeable or airship. Airship “Adjutant Vincenot” was placed north of Dommartin-lès-Tuol. Airship was named after adjutant Henri Leon Emile Vincenot. Adjutant Vincenot was the first French airship to use a wireless telegraph. The key is Morse-key or Morse-clef. Morse manipulator.
Clue 7: From Toul go to Carignan and take T-shape orthogonal. 92.5 kilometer left end up palace Tau in Reims.
Clue 8: My arrow landed in Luneville. I landed the Moon. Moon is round. I drew a circle whose center is near Toul. The perimeter runs through Luneville and Grand and crosses the Carignan-Toul line at Les Eparges. Les Eparges has a hill whose surface is full of craters like the Moon.
Clue 9: We will find Adjutant Vincenot again. He was shot down in Les Eparges. The wind no longer moved him.
You can find the point C with “Monument Le Coq”.
And the point X with “Monument X”.
I have always wanted to dig under X.
Craters are good place to hide the owl. Open area, no roots. Just be careful. There may still be explosives on the ground.