diff --git a/frontend/src/lib/stores/trailMarkers.svelte.ts b/frontend/src/lib/stores/trailMarkers.svelte.ts
index dbaf98c..948b525 100644
--- a/frontend/src/lib/stores/trailMarkers.svelte.ts
+++ b/frontend/src/lib/stores/trailMarkers.svelte.ts
@@ -25,6 +25,23 @@ export class TrailMarkerStore {
 		return this.byTrail(trailId).filter((r) => !r.resolved)
 	}
 
+	/**
+	 * Ändern darf, wer den Marker angelegt hat, sowie Trail-Paten und
+	 * Team-Admins — dieselbe Regel wie in der updateRule der Collection.
+	 * Der Trail wird übergeben, weil der Store ihn nicht kennt.
+	 */
+	canEdit(marker: TrailMarkersResponse, stewards: string[], teamOwner?: string, teamAdmins: string[] = []): boolean {
+		const uid = auth.user?.id
+		if (!uid) return false
+
+		return (
+			marker.created_by === uid ||
+			stewards.includes(uid) ||
+			teamOwner === uid ||
+			teamAdmins.includes(uid)
+		)
+	}
+
 	async load() {
 		this.loading = true
 		this.error = null