diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index c856a6d..a40c777 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -46,12 +46,12 @@ ICS downloads read the following entry fields when present:
 |---|---|
 | `LOCATION` | `address`, falling back to `location` — only when the value is a string |
 | `URL` | `online_url`, then deprecated `link`, then deprecated `location` when that string is a URL |
-| `GEO` | `coordinates` (`latitude` / `longitude`) |
+| `GEO` | `coordinates` (`latitude` / `longitude`) — declared on the event fieldset |
 | `DESCRIPTION` | `description` |
 
 A URL-valued `location` (with no separate `address` / `online_url` / `link`) currently emits **both** `LOCATION:` and `URL:`. Prefer `online_url` for join links; `link` and the URL-valued `location` fallback are deprecated and will be removed in 7.0.
 
-The `coordinates` field must be a keyed array:
+`coordinates` shape:
 
 ```php
 'coordinates' => [
@@ -60,6 +60,8 @@ The `coordinates` field must be a keyed array:
 ],
 ```
 
+Partial or non-numeric coordinates are skipped (no `GEO:`) rather than failing the download.
+
 If your field names differ from the defaults above, use a [Computed Value](https://statamic.dev/content-modeling/computed-values#defining-computed-values) to map them.
 
 ---
@@ -84,6 +86,7 @@ Using the sample fieldset is the fastest way to get started.
 | Field | Description |
 |-------|-------------|
 | `online_url` | Join link for online or hybrid events (Zoom, livestream, etc.). Optional; can be combined with a physical place once `location` is declared. |
+| `coordinates` | Optional `latitude` / `longitude` floats for ICS `GEO:`. Only meaningful alongside a physical location. |
 
 `link` is deprecated in favour of `online_url` and will be removed in 7.0.
 
diff --git a/resources/fieldsets/event.yaml b/resources/fieldsets/event.yaml
index 9ba674c..c0831d3 100644
--- a/resources/fieldsets/event.yaml
+++ b/resources/fieldsets/event.yaml
@@ -219,3 +219,24 @@ fields:
         - nullable
         - url
       instructions: 'Join link for online or hybrid events (Zoom, livestream, etc.).'
+  -
+    handle: coordinates
+    field:
+      type: group
+      display: Coordinates
+      fullscreen: false
+      border: false
+      instructions: 'Optional map coordinates for ICS GEO. Only meaningful alongside a physical location.'
+      fields:
+        -
+          handle: latitude
+          field:
+            type: float
+            display: Latitude
+            width: 50
+        -
+          handle: longitude
+          field:
+            type: float
+            display: Longitude
+            width: 50
diff --git a/tests/Http/Contollers/IcsControllerTest.php b/tests/Http/Contollers/IcsControllerTest.php
index 121c5ae..bcdc23f 100755
--- a/tests/Http/Contollers/IcsControllerTest.php
+++ b/tests/Http/Contollers/IcsControllerTest.php
@@ -581,3 +581,130 @@
     $this->assertStringContainsString('URL:https://zoom.us/j/multiday', $multiDate);
     expect(substr_count($multiWhole, 'URL:https://zoom.us/j/multiday'))->toBe(2);
 });
+
+test('declared coordinates emit GEO', function () {
+    Carbon::setTestNow(now()->setTimeFromTimeString('10:00'));
+
+    Entry::make()
+        ->collection('events')
+        ->slug('coords-event')
+        ->id('coords-id')
+        ->data([
+            'title' => 'Coords Event',
+            'start_date' => Carbon::now()->toDateString(),
+            'start_time' => '11:00',
+            'end_time' => '12:00',
+            'address' => '123 Main St',
+            'coordinates' => [
+                'latitude' => 49.28,
+                'longitude' => -123.12,
+            ],
+        ])->save();
+
+    $content = $this->get(route('statamic.events.ics.show', [
+        'date' => now()->toDateString(),
+        'event' => 'coords-id',
+    ]))->assertDownload('coords-event.ics')->streamedContent();
+
+    $this->assertStringContainsString('GEO:49.28;-123.12', $content);
+});
+
+test('coordinates field rejects non-numeric latitude or longitude', function () {
+    $fields = \Statamic\Facades\Fieldset::find('events::event')->fields();
+
+    expect(fn () => $fields->addValues([
+        'coordinates' => [
+            'latitude' => 'north',
+            'longitude' => 50,
+        ],
+    ])->validator()->validate())->toThrow(\Illuminate\Validation\ValidationException::class);
+});
+
+test('coordinates are included on all four download routes', function () {
+    Carbon::setTestNow(now());
+
+    Entry::make()
+        ->collection('events')
+        ->slug('coords-single')
+        ->id('coords-single-id')
+        ->data([
+            'title' => 'Coords Single',
+            'start_date' => now()->toDateString(),
+            'start_time' => '11:00',
+            'end_time' => '12:00',
+            'coordinates' => [
+                'latitude' => 40,
+                'longitude' => 50,
+            ],
+        ])->save();
+
+    Entry::make()
+        ->collection('events')
+        ->slug('coords-recurring')
+        ->id('coords-recurring-id')
+        ->data([
+            'title' => 'Coords Recurring',
+            'start_date' => now()->toDateString(),
+            'start_time' => '11:00',
+            'end_time' => '12:00',
+            'recurrence' => 'weekly',
+            'coordinates' => [
+                'latitude' => 40,
+                'longitude' => 50,
+            ],
+        ])->save();
+
+    Entry::make()
+        ->collection('events')
+        ->slug('coords-multi-day')
+        ->id('coords-multi-day-id')
+        ->data([
+            'title' => 'Coords Multi Day',
+            'multi_day' => true,
+            'coordinates' => [
+                'latitude' => 40,
+                'longitude' => 50,
+            ],
+            'days' => [
+                [
+                    'date' => now()->toDateString(),
+                    'start_time' => '19:00',
+                    'end_time' => '21:00',
+                ],
+                [
+                    'date' => now()->addDay()->toDateString(),
+                    'start_time' => '11:00',
+                    'end_time' => '15:00',
+                ],
+            ],
+        ])->save();
+
+    $single = $this->get(route('statamic.events.ics.show', [
+        'date' => now()->toDateString(),
+        'event' => 'coords-single-id',
+    ]))->assertDownload('coords-single.ics')->streamedContent();
+
+    $recurringDate = $this->get(route('statamic.events.ics.show', [
+        'date' => now()->toDateString(),
+        'event' => 'coords-recurring-id',
+    ]))->assertDownload('coords-recurring.ics')->streamedContent();
+
+    $recurringWhole = $this->get(route('statamic.events.ics.show', [
+        'event' => 'coords-recurring-id',
+    ]))->assertDownload('coords-recurring.ics')->streamedContent();
+
+    $multiDate = $this->get(route('statamic.events.ics.show', [
+        'date' => now()->toDateString(),
+        'event' => 'coords-multi-day-id',
+    ]))->assertDownload('coords-multi-day.ics')->streamedContent();
+
+    $multiWhole = $this->get(route('statamic.events.ics.show', [
+        'event' => 'coords-multi-day-id',
+    ]))->assertDownload('coords-multi-day.ics')->streamedContent();
+
+    $this->assertStringContainsString('GEO:40;50', $single);
+    $this->assertStringContainsString('GEO:40;50', $recurringDate);
+    $this->assertStringContainsString('GEO:40;50', $recurringWhole);
+    $this->assertStringContainsString('GEO:40;50', $multiDate);
+    expect(substr_count($multiWhole, 'GEO:40;50'))->toBe(2);
+});