The fundamental reference marker for the NGF/IGN69 system, designated M.AC-0-VIII, is located inside the buildings of the Marseille Tide Gauge.
Sources
- Les réseaux de nivellement français - Géodésie (geodesie.ign.fr)
- https://www.aftopo.org/lexique/repere-fondamental-du-ngf/ (aftopo.org)
- https://refmar.shom.fr/references-de-hauteur-en-maregraphie (refmar.shom.fr)
- https://journals.openedition.org/ephaistos/8716?lang=en (journals.openedition.org)
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