diff --git a/TODO.md b/TODO.md
index 71acad7..0a28d0e 100644
--- a/TODO.md
+++ b/TODO.md
@@ -5,7 +5,7 @@ Phaser 3 migration
 ------------------
 
 * Restore fullscreen mode (and add a fullscreen incentive before the menu)
-* Fix valuebar requiring to be in root display list
+* Fix valuebar requiring to be in root display list (use tile sprite ?)
 * Restore unit tests about boundaries (in UITools)
 
 Menu/settings/saves
diff --git a/data/stage2/image/battle/hud/grid-invalid.png b/data/stage2/image/battle/hud/grid-invalid.png
new file mode 100644
index 0000000..0424653
Binary files /dev/null and b/data/stage2/image/battle/hud/grid-invalid.png differ
diff --git a/data/stage2/image/battle/hud/grid-ok.png b/data/stage2/image/battle/hud/grid-ok.png
new file mode 100644
index 0000000..3ddda64
Binary files /dev/null and b/data/stage2/image/battle/hud/grid-ok.png differ
diff --git a/data/stage2/image/battle/hud/grid-power.png b/data/stage2/image/battle/hud/grid-power.png
new file mode 100644
index 0000000..60cab26
Binary files /dev/null and b/data/stage2/image/battle/hud/grid-power.png differ
diff --git a/src/ui/battle/Targetting.ts b/src/ui/battle/Targetting.ts
index d176e0d..797134e 100644
--- a/src/ui/battle/Targetting.ts
+++ b/src/ui/battle/Targetting.ts
@@ -27,6 +27,11 @@ module TK.SpaceTac.UI {
         impact_area: UIGraphics
         impact_indicators: UIContainer
 
+        // Grid indicators
+        grid_ok: UIBatch
+        grid_power: UIBatch
+        grid_invalid: UIBatch
+
         // Diffs display
         diffs_move: UIGraphics
 
@@ -57,6 +62,9 @@ module TK.SpaceTac.UI {
             this.fire_arrow.setOrigin(1, 0.5);
             this.fire_arrow.setVisible(false);
             this.impact_indicators = builder.container("impact-indicators", 0, 0, false);
+            this.grid_ok = builder.batch({ image: "battle-hud-grid-ok", x: -24, y: -20 });
+            this.grid_power = builder.batch({ image: "battle-hud-grid-power", x: -24, y: -20 });
+            this.grid_invalid = builder.batch({ image: "battle-hud-grid-invalid", x: -24, y: -20 });
         }
 
         /**
@@ -221,6 +229,35 @@ module TK.SpaceTac.UI {
             });
         }
 
+        /**
+         * Update the grid indicators
+         */
+        updateGridIndicators(): void {
+            this.grid_ok.clear();
+            this.grid_power.clear();
+            this.grid_invalid.clear();
+
+            if (this.ship && this.action) {
+                let grid = this.ship.grid;
+                let action = this.action;
+                let simulator = new MoveFireSimulator(this.ship, grid);
+
+                range(35).forEach(x => {
+                    range(20).forEach(y => {
+                        let target = Target.newFromLocation(x * 50, y * 50).snap(grid);
+                        let result = simulator.simulateAction(action, target);
+                        if (result.status == MoveFireStatus.OK) {
+                            this.grid_ok.add(target.x, target.y);
+                        } else if (result.status == MoveFireStatus.NOT_ENOUGH_POWER) {
+                            this.grid_power.add(target.x, target.y);
+                        } else {
+                            this.grid_invalid.add(target.x, target.y);
+                        }
+                    });
+                });
+            }
+        }
+
         /**
          * Update visual effects to show the simulation of current action/target
          */
@@ -329,6 +366,8 @@ module TK.SpaceTac.UI {
 
                 this.setTarget(null);
             }
+
+            this.updateGridIndicators();
         }
 
         /**
diff --git a/src/ui/common/UIBatch.ts b/src/ui/common/UIBatch.ts
new file mode 100644
index 0000000..1a6ace6
--- /dev/null
+++ b/src/ui/common/UIBatch.ts
@@ -0,0 +1,50 @@
+module TK.SpaceTac.UI {
+    export interface UIBatchOptions {
+        // Image key
+        image: string
+
+        // Initial location
+        x?: number
+        y?: number
+    }
+
+    /**
+     * UI component to display a batch of the same image repeated a great number of times
+     */
+    export class UIBatch {
+        private internal: Phaser.GameObjects.Blitter
+
+        constructor(view: BaseView, options: UIBatchOptions) {
+            let info = view.getImageInfo(options.image);
+            this.internal = view.add.blitter(options.x || 0, options.y || 0, info.key, info.frame);
+        }
+
+        /**
+         * Add to a container
+         */
+        addToContainer(container: UIContainer): void {
+            container.add(this.internal);
+        }
+
+        /**
+         * Set the location of the whole batch
+         */
+        setPosition(x: number, y: number): void {
+            this.internal.setPosition(x, y);
+        }
+
+        /**
+         * Clear the batch of all items
+         */
+        clear(): void {
+            this.internal.clear();
+        }
+
+        /**
+         * Add an item to the batch
+         */
+        add(x: number, y: number): void {
+            this.internal.create(x, y);
+        }
+    }
+}
diff --git a/src/ui/common/UIBuilder.ts b/src/ui/common/UIBuilder.ts
index d0ae2f3..c67536e 100644
--- a/src/ui/common/UIBuilder.ts
+++ b/src/ui/common/UIBuilder.ts
@@ -180,6 +180,19 @@ module TK.SpaceTac.UI {
             return result;
         }
 
+        /**
+         * Add a batch of images
+         */
+        batch(options: UIBatchOptions): UIBatch {
+            let result = new UIBatch(this.view, options);
+            if (this.parent instanceof UIContainer) {
+                result.addToContainer(this.parent);
+            } else {
+                console.error("Cannot add a batch to an image parent");
+            }
+            return result;
+        }
+
         /**
          * Add a hoverable and/or clickable button
          *