diff --git a/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsGestures.swift b/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsGestures.swift
index 275b0c5..b740ddc 100644
--- a/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsGestures.swift
+++ b/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsGestures.swift
@@ -1,7 +1,7 @@
 import CoreGraphics
 import Foundation
 import MapCore
-import MapConductorCore
+@_spi(MapConductorDriver) import MapConductorCore
 import UIKit
 
 /// 実装点 E / F。SDK のタッチをコアの受け口へつなぐ。
@@ -214,26 +214,15 @@ extension OpenMobileMapsMapViewController {
         emitMapClick(position)
     }
 
-    /// strategy 側マーカーの当たり判定と配送。重なっているときはアンカーが近いほうを選ぶ。
+    /// strategy 側マーカーの当たり判定と配送。選び方はコアの ``MarkerHitTest/pick`` と同じ。
     private func handleStrategyTap(at point: CGPoint) -> Bool {
         guard let strategyController = strategyManager.controller else { return false }
-        let defaultIcon = DefaultMarkerIcon()
-        var bestState: MarkerState?
-        var bestDistance = CGFloat.infinity
-        for entity in strategyController.markerManager.allEntities() where entity.state.clickable {
-            guard let screen = ommHolder.toScreenOffset(position: entity.state.position) else { continue }
-            guard MarkerHitTest.hitsIcon(
-                touchScreen: point,
-                markerScreen: screen,
-                state: entity.state,
-                defaultIcon: defaultIcon
-            ) else { continue }
-            let distance = hypot(point.x - screen.x, point.y - screen.y)
-            if distance < bestDistance {
-                bestDistance = distance
-                bestState = entity.state
-            }
-        }
+        let bestState = MarkerHitTest.pick(
+            touchScreen: point,
+            candidates: strategyController.markerManager.allEntities().map(\.state).filter(\.clickable),
+            state: { $0 },
+            project: { ommHolder.toScreenOffset(position: $0) }
+        )
         guard let state = bestState else { return false }
         strategyController.dispatchClick(state)
         return true
diff --git a/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsMarkers.swift b/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsMarkers.swift
index 0e880c5..24c1b7a 100644
--- a/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsMarkers.swift
+++ b/Sources/MapConductorForOpenMobileMaps/OpenMobileMapsMarkers.swift
@@ -1,7 +1,7 @@
 import CoreGraphics
 import Foundation
 import MapCore
-import MapConductorCore
+@_spi(MapConductorDriver) import MapConductorCore
 import UIKit
 
 /*
@@ -560,29 +560,20 @@ final class OpenMobileMapsMarkerController:
         markerManager.getEntity(id)?.state
     }
 
-    /// 画面座標にあるマーカー。重なっているときはアンカーが近いほうを選ぶ。
+    /// 画面座標にあるマーカー。選び方はコアの ``MarkerHitTest/pick`` と同じで、指の下にアイコン
+    /// （ラベル込み）が描かれているマーカーを、アンカーの近い別のマーカーより優先する。
     ///
     /// 受け取るのは**入れ物（`OpenMobileMapsMapSurface`）の座標**。ホルダーの
     /// `toScreenOffset` も入れ物の座標へ畳んで返すので、両者は同じ系で比べられる。
     func markerId(atScreenPoint point: CGPoint, where isEligible: (MarkerState) -> Bool) -> String? {
         guard let holder else { return nil }
-        var bestId: String?
-        var bestDistance = CGFloat.infinity
-        for entity in markerManager.allEntities() where isEligible(entity.state) {
-            guard let screen = holder.toScreenOffset(position: entity.state.position) else { continue }
-            guard MarkerHitTest.hitsIcon(
-                touchScreen: point,
-                markerScreen: screen,
-                state: entity.state,
-                defaultIcon: defaultIcon
-            ) else { continue }
-            let distance = hypot(point.x - screen.x, point.y - screen.y)
-            if distance < bestDistance {
-                bestDistance = distance
-                bestId = entity.state.id
-            }
-        }
-        return bestId
+        return MarkerHitTest.pick(
+            touchScreen: point,
+            candidates: markerManager.allEntities().map(\.state).filter(isEligible),
+            state: { $0 },
+            project: { holder.toScreenOffset(position: $0) },
+            defaultIcon: defaultIcon
+        )?.id
     }
 
     func unbind() {