diff --git a/static/script.js b/static/script.js
index f405585d..85e2909f 100644
--- a/static/script.js
+++ b/static/script.js
@@ -3969,8 +3969,8 @@ function updateRadarWindow(msg) {
   ctx.stroke();
 
   // Rotate world by heading so player facing = up on canvas
-  // In dungeons, add 180° to match UB's (heading - 180) rotation
-  const rotAngle = isDungeon ? headingRad + Math.PI : headingRad;
+  // In dungeons, use (PI - heading) to match UB's canvas rotation
+  const rotAngle = isDungeon ? (Math.PI - headingRad) : headingRad;
 
   // Draw objects and cache positions for click hit-testing
   const cosA = Math.cos(rotAngle);
@@ -3987,7 +3987,9 @@ function updateRadarWindow(msg) {
     }
 
     const dx = dX * cosA - dY * sinA;
-    const dy = -(dX * sinA + dY * cosA);
+    // In dungeons, don't negate dy (180° heading offset handles N/S)
+    // In overworld, negate for north-up
+    const dy = isDungeon ? (dX * sinA + dY * cosA) : -(dX * sinA + dY * cosA);
 
     const px = cx + dx * scale;
     const py = cy + dy * scale;