diff --git a/scripts/verify-weixin-output.mjs b/scripts/verify-weixin-output.mjs
index d437cfb..06b771b 100644
--- a/scripts/verify-weixin-output.mjs
+++ b/scripts/verify-weixin-output.mjs
@@ -12,6 +12,9 @@ const expectedPages = [
   'pages/planner/index',
   'pages/check-in/index',
   'pages/check-in/records',
+  // 旧详情页路由的兼容跳板，只做重定向。缺了它，还攥着旧路径的入口
+  // （模拟器上次停留的路由、预览启动页、已发出的分享卡片）会白屏。
+  'pages/poi/detail',
 ]
 // 点位详情页放在 pages-poi 分包里，连带 800×600 大图一起按需下载，
 // 否则 30 张大图会把主包顶过 2 MB 上限。
diff --git a/src/domain/poi/validation.ts b/src/domain/poi/validation.ts
index 4f5c655..4c50093 100644
--- a/src/domain/poi/validation.ts
+++ b/src/domain/poi/validation.ts
@@ -28,6 +28,27 @@ function isRecord(value: unknown): value is Record<string, unknown> {
   return typeof value === 'object' && value !== null && !Array.isArray(value)
 }
 
+/**
+ * 运行时坐标可信判断，用于点位数据校验与地图/定位状态写入。
+ *
+ * 除了有限性和全球范围，还必须拒绝经纬度为 0 的坐标：
+ * 地图 SDK 尚未拿到定位、或定位接口降级时会回传 (0, 0)，
+ * 它落在几内亚湾（Null Island）。微信 `<map>` 在境外坐标下会切到 HERE 底图，
+ * 视觉上就是「地图跑到非洲的海里」，还会因为境外瓦片加载失败而留下大片空白。
+ */
+export function isTrustworthyCoordinate(longitude: unknown, latitude: unknown): boolean {
+  return typeof longitude === 'number'
+    && typeof latitude === 'number'
+    && Number.isFinite(longitude)
+    && Number.isFinite(latitude)
+    && longitude !== 0
+    && latitude !== 0
+    && longitude >= -180
+    && longitude <= 180
+    && latitude >= -90
+    && latitude <= 90
+}
+
 function isNonEmptyString(value: unknown): value is string {
   return typeof value === 'string' && value.trim().length > 0
 }
@@ -194,14 +215,7 @@ function validateOpeningHours(openingHours: PoiOpeningHours, poiId: string, issu
 function validateCoordinates(poi: Poi, issues: PoiValidationIssue[]): void {
   const { longitude, latitude } = poi
   const id = isNonEmptyString(poi.id) ? poi.id : 'invalid_poi'
-  if (!Number.isFinite(longitude)
-    || !Number.isFinite(latitude)
-    || longitude < -180
-    || longitude > 180
-    || latitude < -90
-    || latitude > 90
-    || longitude === 0
-    || latitude === 0) {
+  if (!isTrustworthyCoordinate(longitude, latitude)) {
     addIssue(issues, 'COORDINATE_INVALID', `pois.${id}.coordinates`, '经纬度必须为非零的有限合法数值', id)
     return
   }
diff --git a/src/pages.json b/src/pages.json
index 9824590..c0b1eb6 100644
--- a/src/pages.json
+++ b/src/pages.json
@@ -83,6 +83,17 @@
         "navigationBarTextStyle": "black",
         "backgroundColor": "#f4f8f6"
       }
+    },
+    {
+      "path": "pages/poi/detail",
+      "type": "page",
+      "layout": "map",
+      "style": {
+        "navigationBarTitleText": "点位详情",
+        "navigationBarBackgroundColor": "#ffffff",
+        "navigationBarTextStyle": "black",
+        "backgroundColor": "#f5f7f6"
+      }
     }
   ],
   "globalStyle": {
diff --git a/src/pages/map/index.vue b/src/pages/map/index.vue
index dfc663c..77271ff 100644
--- a/src/pages/map/index.vue
+++ b/src/pages/map/index.vue
@@ -1,11 +1,12 @@
 <script setup lang="ts">
-import type { PoiCategory, PoiDatasetMeta, PoiSummary } from '@/domain/poi'
+import type { GeoPoint, PoiCategory, PoiDatasetMeta, PoiSummary } from '@/domain/poi'
 import type { PlanResponse } from '@/domain/travel'
 import type { PoiMapMarker } from '@/services/map'
 import MapFilterHeader from '@/components/map/MapFilterHeader.vue'
 import PoiSummaryCard from '@/components/map/PoiSummaryCard.vue'
 import PageState from '@/components/poi/PageState.vue'
 import { getPoiRepository } from '@/data/poi'
+import { isTrustworthyCoordinate } from '@/domain/poi'
 import { buildMarkerIdMap, createPoiMarkers } from '@/services/map'
 import { getSessionPlanningOrigin, loadPlan } from '@/services/travel-assistant'
 import { useLocationStore, useMapStore } from '@/stores'
@@ -243,6 +244,9 @@ function selectCategory(categoryCode: string | null) {
 }
 
 function selectMarker(event: { detail: { markerId: number } }) {
+  // 跳转过程中原生地图还在，别再受理点选。
+  if (navigating.value)
+    return
   lastMarkerTapAt.value = Date.now()
   const poiId = markerIdToPoiId.value.get(Number(event.detail.markerId))
   if (!poiId)
@@ -267,22 +271,49 @@ function clearSelection() {
   mapStore.selectPoi(null)
 }
 
+/**
+ * 尽量直接从 regionchange 事件里取中心点。
+ * 微信把中心点放在 `detail.centerLocation`，老基础库才退化到 `detail.longitude`。
+ * 两者都拿不到时才回落到异步的 getCenterLocation。
+ */
+function readEventCenter(detail: Record<string, unknown>): GeoPoint | null {
+  const center = detail.centerLocation
+  if (center && typeof center === 'object') {
+    const { longitude, latitude } = center as Record<string, unknown>
+    if (isTrustworthyCoordinate(Number(longitude), Number(latitude)))
+      return { longitude: Number(longitude), latitude: Number(latitude) }
+  }
+
+  const longitude = Number(detail.longitude)
+  const latitude = Number(detail.latitude)
+  if (isTrustworthyCoordinate(longitude, latitude))
+    return { longitude, latitude }
+
+  return null
+}
+
 function updateViewport(event: { type: string, detail: Record<string, unknown> }) {
   const changeType = String(event.detail.type ?? event.type ?? '')
   if (changeType !== 'end')
     return
+  // 地图上下文还没建立、或正在跳转详情页时，地图回传的中心点不可信，直接丢弃。
+  if (!mapReady.value || navigating.value)
+    return
 
-  const longitude = Number(event.detail.longitude)
-  const latitude = Number(event.detail.latitude)
   const eventScale = Number(event.detail.scale)
   const fallbackScale = Number.isFinite(eventScale) ? eventScale : viewport.value.scale
-  if (Number.isFinite(longitude) && Number.isFinite(latitude)) {
-    updateViewportWithScale(longitude, latitude, fallbackScale)
+
+  const center = readEventCenter(event.detail)
+  if (center) {
+    updateViewportWithScale(center.longitude, center.latitude, fallbackScale)
     return
   }
 
   mapContext.value?.getCenterLocation({
     success: (location: { longitude: number, latitude: number }) => {
+      // 地图 SDK 还没拿到有效中心点时会回传 (0, 0)，写进 viewport 会把地图甩到几内亚湾。
+      if (!isTrustworthyCoordinate(location.longitude, location.latitude))
+        return
       updateViewportWithScale(location.longitude, location.latitude, fallbackScale)
     },
   })
@@ -485,7 +516,17 @@ function openDetail(poiId: string) {
 }
 
 function openCheckInRecords() {
-  uni.navigateTo({ url: '/pages/check-in/records' })
+  if (navigating.value)
+    return
+  navigating.value = true
+  uni.navigateTo({
+    url: '/pages/check-in/records',
+    complete: () => {
+      setTimeout(() => {
+        navigating.value = false
+      }, 500)
+    },
+  })
 }
 
 function initializeMap() {
@@ -527,6 +568,8 @@ onReady(() => {
 })
 
 onShow(() => {
+  // 从详情页返回后立刻恢复地图交互，不等 navigateTo 的 500ms 兜底定时器。
+  navigating.value = false
   loadActivePlan()
   if (activePlan.value)
     includePlannedRoute()
@@ -597,6 +640,8 @@ onUnload(stopForegroundLocationUpdates)
           :enable-rotate="false"
           :enable-overlooking="false"
           :show-compass="false"
+          :enable-scroll="!navigating"
+          :enable-zoom="!navigating"
           @markertap="selectMarker"
           @tap="clearSelection"
           @regionchange="updateViewport"
diff --git a/src/pages/poi/detail.vue b/src/pages/poi/detail.vue
new file mode 100644
index 0000000..4763b37
--- /dev/null
+++ b/src/pages/poi/detail.vue
@@ -0,0 +1,62 @@
+<script setup lang="ts">
+import PageState from '@/components/poi/PageState.vue'
+
+/**
+ * 旧详情页路由的兼容跳板。
+ *
+ * 详情页已从 `pages/poi/detail` 移入 `pages-poi` 分包（见 f8ad5e1）。
+ * 旧路径一旦从 app.json 消失，任何还攥着它的入口 —— 开发者工具模拟器上次停留的
+ * 路由、预览时的启动页、已经发出去的分享卡片或二维码 —— 冷启动都会落到一个
+ * 微信解析不出来的路由上，渲染成白屏，左上角只剩一个回首页的小房子。
+ *
+ * 这里保留一个只做重定向的空页面把流量接回新路径。等所有入口都刷新过之后可以删掉。
+ */
+const REDIRECT_FAILURE_TOAST = '点位详情已更新，正在返回地图'
+
+function fallbackToMap() {
+  uni.reLaunch({ url: '/pages/map/index' })
+}
+
+onLoad((query) => {
+  const rawPoiId = typeof query?.poiId === 'string' ? query.poiId : ''
+  if (!rawPoiId.trim()) {
+    fallbackToMap()
+    return
+  }
+
+  // redirectTo 而非 navigateTo：跳板本身不该留在页面栈里。
+  uni.redirectTo({
+    url: `/pages-poi/detail?poiId=${encodeURIComponent(rawPoiId)}`,
+    fail: () => {
+      uni.showToast({ title: REDIRECT_FAILURE_TOAST, icon: 'none' })
+      fallbackToMap()
+    },
+  })
+})
+</script>
+
+<template>
+  <view class="poi-detail-redirect">
+    <PageState state="loading" title="正在打开点位详情…" />
+  </view>
+</template>
+
+<route lang="yaml">
+layout: map
+style:
+  navigationBarTitleText: 点位详情
+  navigationBarBackgroundColor: '#ffffff'
+  navigationBarTextStyle: black
+  backgroundColor: '#f5f7f6'
+</route>
+
+<style scoped lang="scss">
+.poi-detail-redirect {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  min-height: 100vh;
+  background: #f5f7f6;
+}
+</style>
diff --git a/src/services/location/current-location.ts b/src/services/location/current-location.ts
index 37359a4..bf8e999 100644
--- a/src/services/location/current-location.ts
+++ b/src/services/location/current-location.ts
@@ -1,4 +1,5 @@
 import type { CheckInLocationSnapshot } from '@/domain/check-in'
+import { isTrustworthyCoordinate } from '@/domain/poi'
 
 interface CurrentLocationOptions {
   highAccuracyExpireTime?: number
@@ -63,7 +64,7 @@ export function getCurrentGcj02Location(options: CurrentLocationOptions = {}): P
         const longitude = Number(result.longitude)
         const latitude = Number(result.latitude)
         const accuracy = Number(result.accuracy ?? result.horizontalAccuracy)
-        if (!Number.isFinite(longitude) || !Number.isFinite(latitude)) {
+        if (!isTrustworthyCoordinate(longitude, latitude)) {
           finish(() => reject(new Error('定位结果无效，请稍后重试')))
           return
         }
diff --git a/src/stores/modules/location.ts b/src/stores/modules/location.ts
index 200aa5e..6bb9ea4 100644
--- a/src/stores/modules/location.ts
+++ b/src/stores/modules/location.ts
@@ -1,5 +1,6 @@
 import type { GeoPoint } from '@/domain/poi'
 import { defineStore } from 'pinia'
+import { isTrustworthyCoordinate } from '@/domain/poi'
 
 export type UserLocationStatus = 'idle' | 'locating' | 'ready' | 'denied' | 'unavailable' | 'error'
 
@@ -15,15 +16,6 @@ interface UserLocationState {
   errorMessage: string
 }
 
-function isValidCoordinate(longitude: number, latitude: number): boolean {
-  return Number.isFinite(longitude)
-    && Number.isFinite(latitude)
-    && longitude >= -180
-    && longitude <= 180
-    && latitude >= -90
-    && latitude <= 90
-}
-
 export const useLocationStore = defineStore('user-location-session', {
   state: (): UserLocationState => ({
     status: 'idle',
@@ -36,7 +28,7 @@ export const useLocationStore = defineStore('user-location-session', {
       this.errorMessage = ''
     },
     updateLocation(longitude: number, latitude: number, accuracy?: number | null) {
-      if (!isValidCoordinate(longitude, latitude))
+      if (!isTrustworthyCoordinate(longitude, latitude))
         return false
 
       this.snapshot = {
diff --git a/src/stores/modules/map.ts b/src/stores/modules/map.ts
index 04274ca..3f02b07 100644
--- a/src/stores/modules/map.ts
+++ b/src/stores/modules/map.ts
@@ -1,5 +1,6 @@
-import type { GeoPoint, MapViewport } from '@/domain/poi'
+import type { MapViewport } from '@/domain/poi'
 import { defineStore } from 'pinia'
+import { isTrustworthyCoordinate } from '@/domain/poi'
 
 export const DEFAULT_GUANGMING_VIEWPORT: MapViewport = {
   longitude: 113.935,
@@ -14,8 +15,10 @@ interface MapSessionState {
   plannedRouteVisible: boolean
 }
 
-function isFinitePoint(point: GeoPoint): boolean {
-  return Number.isFinite(point.longitude) && Number.isFinite(point.latitude)
+function isUsableViewport(viewport: MapViewport): boolean {
+  return isTrustworthyCoordinate(viewport.longitude, viewport.latitude)
+    && Number.isFinite(viewport.scale)
+    && viewport.scale > 0
 }
 
 export const useMapStore = defineStore('map-session', {
@@ -33,13 +36,15 @@ export const useMapStore = defineStore('map-session', {
       this.selectedPoiId = poiId
     },
     updateViewport(viewport: MapViewport) {
-      if (!isFinitePoint(viewport) || !Number.isFinite(viewport.scale) || viewport.scale <= 0)
+      if (!isUsableViewport(viewport))
         return
 
       this.viewport = { ...viewport }
     },
     resetViewport(viewport: MapViewport = DEFAULT_GUANGMING_VIEWPORT) {
-      this.viewport = { ...viewport }
+      this.viewport = isUsableViewport(viewport)
+        ? { ...viewport }
+        : { ...DEFAULT_GUANGMING_VIEWPORT }
     },
     showPlannedRoute() {
       this.plannedRouteVisible = true
@@ -50,7 +55,9 @@ export const useMapStore = defineStore('map-session', {
     resetSession(viewport: MapViewport = DEFAULT_GUANGMING_VIEWPORT) {
       this.categoryCode = null
       this.selectedPoiId = null
-      this.viewport = { ...viewport }
+      this.viewport = isUsableViewport(viewport)
+        ? { ...viewport }
+        : { ...DEFAULT_GUANGMING_VIEWPORT }
       this.plannedRouteVisible = false
     },
   },
diff --git a/test/map-store.test.ts b/test/map-store.test.ts
index c8ab961..a18b274 100644
--- a/test/map-store.test.ts
+++ b/test/map-store.test.ts
@@ -53,4 +53,38 @@ describe('map session store', () => {
     expect(store.updateLocation(181, 22.76, 10)).toBe(false)
     expect(store.snapshot).toBeNull()
   })
+
+  // 定位接口降级 / 地图 SDK 还没拿到定位时会回传 (0, 0)，
+  // 它落在几内亚湾，会把地图甩到非洲外海并触发境外底图。
+  it('rejects null-island coordinates for the map viewport', () => {
+    const store = useMapStore()
+    store.updateViewport({ longitude: 0, latitude: 0, scale: 15 })
+    expect(store.viewport).toEqual(DEFAULT_GUANGMING_VIEWPORT)
+
+    store.updateViewport({ longitude: 113.94, latitude: 0, scale: 15 })
+    expect(store.viewport).toEqual(DEFAULT_GUANGMING_VIEWPORT)
+
+    store.updateViewport({ longitude: 0, latitude: 22.76, scale: 15 })
+    expect(store.viewport).toEqual(DEFAULT_GUANGMING_VIEWPORT)
+  })
+
+  it('rejects null-island coordinates for the user location', () => {
+    const store = useLocationStore()
+    expect(store.updateLocation(0, 0, 10)).toBe(false)
+    expect(store.updateLocation(113.94, 0, 10)).toBe(false)
+    expect(store.updateLocation(0, 22.76, 10)).toBe(false)
+    expect(store.snapshot).toBeNull()
+    expect(store.status).toBe('idle')
+  })
+
+  it('falls back to the default viewport when reset is given an unusable one', () => {
+    const store = useMapStore()
+    store.updateViewport({ longitude: 113.94, latitude: 22.76, scale: 13 })
+
+    store.resetViewport({ longitude: 0, latitude: 0, scale: 11 })
+    expect(store.viewport).toEqual(DEFAULT_GUANGMING_VIEWPORT)
+
+    store.resetSession({ longitude: 0, latitude: 0, scale: 11 })
+    expect(store.viewport).toEqual(DEFAULT_GUANGMING_VIEWPORT)
+  })
 })
diff --git a/uni-pages.d.ts b/uni-pages.d.ts
index d10c805..2c0f814 100644
--- a/uni-pages.d.ts
+++ b/uni-pages.d.ts
@@ -10,6 +10,7 @@ interface NavigateToOptions {
        "/pages/check-in/records" |
        "/pages/itinerary/index" |
        "/pages/planner/index" |
+       "/pages/poi/detail" |
        "/pages-poi/detail";
 }
 interface RedirectToOptions extends NavigateToOptions {}