diff --git a/README.md b/README.md
index 1d18b744..d38e4e2d 100644
--- a/README.md
+++ b/README.md
@@ -363,7 +363,7 @@ GarageStack checks your vehicle's state every 5 minutes and sends both a browser
 | Car left unlocked | `doors/locked = false` while engine is off |
 | Door left open | Any door, boot, or bonnet open while engine is off |
 | Window left open | Any window open while engine is off |
-| Moved while parked | The car reports a position more than 300 m from where it parked, with the engine off: towed, lifted onto a truck, or taken on a ferry. Sent once per parking, with the car's first report after the move (a sleeping car only reports now and then) |
+| Moved while parked | The car reports a position more than 1.5 km from where it parked, with the engine off: towed, lifted onto a truck, or taken on a ferry. Sent once per parking, with the car's first report after the move (a sleeping car only reports now and then) |
 | Arrived home or at work | The car parks at a home or work place with **Notify on arrival and departure** switched on (Trip log > Home and work), judged by the position of the poll it parked in. Not sent for a drive that never left the place it started in |
 | Left home or work | The car drives out of such a place: sent on its first position outside the place's radius, so starting the engine to warm the car up sends nothing |
 | Charging complete | Charging stops while the cable is still connected (plug-in vehicles) |
diff --git a/src/GarageStack.Tests/PushNotificationCheckServiceTests.cs b/src/GarageStack.Tests/PushNotificationCheckServiceTests.cs
index 0974b370..f4d474d1 100644
--- a/src/GarageStack.Tests/PushNotificationCheckServiceTests.cs
+++ b/src/GarageStack.Tests/PushNotificationCheckServiceTests.cs
@@ -695,6 +695,18 @@ public void CheckMovedWhileParked_GpsWanderingNearby_StaysQuiet()
         Assert.Empty(alerts);
     }
 
+    // A fix that strayed further still, as one from under a roof can: 0,7 km.
+    [Fact]
+    public void CheckMovedWhileParked_GpsStrayingUnderAKilometre_StaysQuiet()
+    {
+        var alerts = new List<(string, string, string)>();
+
+        CreateService().CheckMovedWhileParked(
+            ParkedInAmsterdam(), Parked(s => { s.Latitude = 52.3763; s.Longitude = 4.8900; }), alerts);
+
+        Assert.Empty(alerts);
+    }
+
     [Fact]
     public void CheckMovedWhileParked_NoParkedPositionOrNoFix_StaysQuiet()
     {
diff --git a/src/GarageStack.Worker/Services/PushNotificationCheckService.cs b/src/GarageStack.Worker/Services/PushNotificationCheckService.cs
index a78f0235..cd332c70 100644
--- a/src/GarageStack.Worker/Services/PushNotificationCheckService.cs
+++ b/src/GarageStack.Worker/Services/PushNotificationCheckService.cs
@@ -145,8 +145,10 @@ internal async Task CheckParkedAsync(
             await SendAsync(vehicle, moved, notifications, ct, onceSince: vehicle.LastParkedAt);
     }
 
-    // Further than GPS wanders in a car park or a garage, nearer than a tow truck takes a car.
-    internal const double MovedWhileParkedMeters = 300;
+    // Further than a parked car's fix strays, nearer than a tow truck or a ferry takes it. A fix
+    // from a garage, a multi-storey or between tall buildings has put a car standing still 700 m
+    // off its spot, so the margin is wide.
+    internal const double MovedWhileParkedMeters = 1500;
 
     /// <summary>
     /// Warns when the car reports a position well away from where it parked while the engine stayed