diff --git a/assets/hub-globe.js b/assets/hub-globe.js
index f97cfd1..fc7e189 100644
--- a/assets/hub-globe.js
+++ b/assets/hub-globe.js
@@ -11,7 +11,7 @@
  * globe3d=8: hub SVG ellipse trace (breaks under rotation — deprecated).
  * globe3d=9: v4 sphere grid only (thin E–W + N–S) — proper rotation baseline.
  * globe3d=10: v4 visible-arc → screen ellipse (hub ry), disk-clipped.
- * globe3d=11: v10 grid + ortho hub land + affine flat-plate wrap fallback.
+ * globe3d=11: v10 grid + geographic mercator-flat land (360° U-wrap).
  */
 export const GLOBE_VIEW = { imgW: 1920, imgH: 1080, cx: 720, cy: 560, r: 322, rim: 330 };
 
@@ -27,6 +27,8 @@ const CONTINENT_INNER_TX = 223.66088631984587;
 const CONTINENT_INNER_TY = 238.0;
 const CONTINENT_INNER_SX = 1.2408477842003853;
 const CONTINENT_INNER_SY = 1.2408477842003853;
+/** Map plate center longitude (extract_red_polygons.py CENTER_LON). */
+const MERCATOR_LON_CENTER = (12 * Math.PI) / 180;
 const RASTER_SCALE = 2;
 const AXIS_STEPS = 160;
 const SPHERE_AXIS_STEPS = 180;
@@ -948,11 +950,13 @@ function sampleFlatPlateFromHub(mercFlat, hpX, hpY) {
   return sampleImageDataBilinearWrapU(mercFlat.data, mercFlat.w, mercFlat.h, sx, sy);
 }
 
-/** Sphere tex → mercator-flat plate (lon offset + inverse Mercator Y). */
+/** Sphere tex → mercator-flat plate (lon center + inverse Mercator Y). */
 function sampleMercFlatFromTex(mercFlat, tex) {
   const ll = texLonLat(tex);
-  const lon = wrapLon(ll.lon + (12 * Math.PI) / 180);
-  return sampleMercFlat(mercFlat, lon, ll.lat);
+  const lon = wrapLon(ll.lon + MERCATOR_LON_CENTER);
+  const lat =
+    Math.max(-1.52, Math.min(1.52, ll.lat / CONTINENT_INNER_SY));
+  return sampleMercFlat(mercFlat, lon, lat);
 }
 
 function isLandPixel(r, g, b, a) {
@@ -1063,19 +1067,13 @@ function sampleLandRgbaMercator(mercFlat, tex) {
   return null;
 }
 
-/** globe3d=11 — ortho hub (reference N–S) + wrapped flat-plate fallback. */
-function sampleLandVisibleHemisphere(continents, mercFlat, tex) {
+/** globe3d=11 — geographic mercator wrap (360°); z > LIMB_Z only. */
+function sampleLandVisibleHemisphere(mercFlat, tex) {
   if (tex.z <= LIMB_Z) {
     return null;
   }
-  const ortho = sampleHub(continents, tex);
-  if (isSolidContinentPixel(ortho[0], ortho[1], ortho[2], ortho[3])) {
-    return hubContinentRgba(ortho);
-  }
-  const hpX = GLOBE_VIEW.cx + tex.x * GLOBE_VIEW.r;
-  const hpY = GLOBE_VIEW.cy - tex.y * GLOBE_VIEW.r;
-  const flat = sampleFlatPlateFromHub(mercFlat, hpX, hpY);
-  if (flat && isHubContinentPixel(flat[0], flat[1], flat[2], flat[3])) {
+  const flat = sampleMercFlatFromTex(mercFlat, tex);
+  if (isHubContinentPixel(flat[0], flat[1], flat[2], flat[3])) {
     return hubContinentRgba(flat);
   }
   return null;
@@ -1291,7 +1289,7 @@ export async function mountHubGlobe(stage, opts) {
         cy,
         r,
         fillDiskRegion(ctx, cx, cy, r, rotation, function (tex) {
-          const l = sampleLandVisibleHemisphere(continents, mercFlat, tex);
+          const l = sampleLandVisibleHemisphere(mercFlat, tex);
           return l || [0, 0, 0, 0];
         })
       );
diff --git a/index.php b/index.php
index c3f6e87..ab45f4d 100644
--- a/index.php
+++ b/index.php
@@ -187,7 +187,7 @@ function hub_h(string $s): string {
       var supportsLayout = !!(window.CSS && CSS.supports && CSS.supports('object-fit', 'cover'));
       var logoEnabled = !!(stage && supportsSvg && supportsLayout);
 
-      var logoBuild = '20260704globe16';
+      var logoBuild = '20260704globe17';
 
       function hubAsset(rel) {
         var link = document.querySelector('link[href*="hub.css"]');