diff --git a/OpenRA.Game/ShroudRenderer.cs b/OpenRA.Game/ShroudRenderer.cs
index eeaccd26a5..aabe46bb7c 100644
--- a/OpenRA.Game/ShroudRenderer.cs
+++ b/OpenRA.Game/ShroudRenderer.cs
@@ -58,8 +58,6 @@ namespace OpenRA
 		bool IsExplored(int x, int y) { return shroud.exploredCells[x,y]; }
 
 		public bool DisplayOnRadar(int x, int y) { return IsExplored(x, y); }
-		
-		public void ResetExplored() { }	// todo
 
 		public void Explore(World w, int2 center, int range) { dirty = true; }
 		public void Explore(Actor a) { if (a.Owner == a.World.LocalPlayer) dirty = true; }
diff --git a/OpenRA.Game/Traits/World/Shroud.cs b/OpenRA.Game/Traits/World/Shroud.cs
index 63f5832681..73bfeea354 100644
--- a/OpenRA.Game/Traits/World/Shroud.cs
+++ b/OpenRA.Game/Traits/World/Shroud.cs
@@ -26,12 +26,12 @@ using System.Drawing;
 
 namespace OpenRA.Traits
 {
-	class ShroudInfo : ITraitInfo
+	public class ShroudInfo : ITraitInfo
 	{
 		public object Create(Actor self) { return new Shroud(self, this); }
 	}
 
-	class Shroud
+	public class Shroud
 	{
 		Map map;
 
@@ -124,5 +124,12 @@ namespace OpenRA.Traits
 			exploredBounds = exploredBounds.HasValue ?
 				Rectangle.Union(exploredBounds.Value, box) : box;
 		}
+
+		public void ResetExploration()		// for `hide map` crate
+		{
+			for (var j = 0; j <= exploredCells.GetUpperBound(1); j++)
+				for (var i = 0; i <= exploredCells.GetUpperBound(0); i++)
+					exploredCells[i, j] = visibleCells[i, j] > 0;
+		}
 	}
 }
diff --git a/OpenRA.Mods.RA/Crates/ResetRadarCrateAction.cs b/OpenRA.Mods.RA/Crates/ResetRadarCrateAction.cs
index ba386e42cd..cb484d993d 100644
--- a/OpenRA.Mods.RA/Crates/ResetRadarCrateAction.cs
+++ b/OpenRA.Mods.RA/Crates/ResetRadarCrateAction.cs
@@ -34,8 +34,9 @@ namespace OpenRA.Mods.RA
 
 		public override void Activate(Actor collector)
 		{
-			collector.Owner.Shroud.ResetExplored();
 			base.Activate(collector);
+			if (collector.Owner == collector.World.LocalPlayer)
+				collector.World.WorldActor.traits.Get<Shroud>().ResetExploration();
 		}
 	}
 }