diff --git a/src/core/MoveFireSimulator.ts b/src/core/MoveFireSimulator.ts
index 41339b2..147d451 100644
--- a/src/core/MoveFireSimulator.ts
+++ b/src/core/MoveFireSimulator.ts
@@ -128,6 +128,7 @@ module TK.SpaceTac {
 
             // Move or approach needed ?
             let move_target: Target | null = null;
+            let move_action: MoveAction | null = null;
             result.move_location = Target.newFromShip(this.ship);
             if (action instanceof MoveAction) {
                 let corrected_target = action.applyReachableRange(this.ship, target, move_margin);
@@ -136,11 +137,12 @@ module TK.SpaceTac {
                     result.need_move = target.getDistanceTo(this.ship.location) > 0;
                     move_target = corrected_target;
                 }
+                move_action = action;
             } else {
-                let engine = this.findEngine();
-                if (engine) {
+                move_action = this.findEngine();
+                if (move_action) {
                     let approach_radius = action.getRangeRadius(this.ship);
-                    let approach = this.getApproach(engine, target, approach_radius, move_margin);
+                    let approach = this.getApproach(move_action, target, approach_radius, move_margin);
                     if (approach instanceof Target) {
                         result.need_move = true;
                         move_target = approach;
@@ -157,18 +159,15 @@ module TK.SpaceTac {
             }
 
             // Check move AP
-            if (result.need_move && move_target) {
-                let engine = this.findEngine();
-                if (engine) {
-                    result.total_move_ap = engine.getActionPointsUsage(this.ship, move_target);
-                    result.can_move = ap > 0;
-                    result.can_end_move = result.total_move_ap <= ap;
-                    result.move_location = move_target;
-                    // TODO Split in "this turn" part and "next turn" part if needed
-                    result.parts.push({ action: engine, target: move_target, ap: result.total_move_ap, possible: result.can_move });
+            if (result.need_move && move_target && move_action) {
+                result.total_move_ap = move_action.getPowerUsage(this.ship, move_target);
+                result.can_move = ap > 0;
+                result.can_end_move = result.total_move_ap <= ap;
+                result.move_location = move_target;
+                // TODO Split in "this turn" part and "next turn" part if needed
+                result.parts.push({ action: move_action, target: move_target, ap: result.total_move_ap, possible: result.can_move });
 
-                    ap -= result.total_move_ap;
-                }
+                ap -= result.total_move_ap;
             }
 
             // Check action AP
@@ -176,7 +175,7 @@ module TK.SpaceTac {
                 result.success = result.need_move && result.can_move;
             } else {
                 result.need_fire = true;
-                result.total_fire_ap = action.getActionPointsUsage(this.ship, target);
+                result.total_fire_ap = action.getPowerUsage(this.ship, target);
                 result.can_fire = result.total_fire_ap <= ap;
                 result.fire_location = target;
                 result.parts.push({ action: action, target: target, ap: result.total_fire_ap, possible: (!result.need_move || result.can_end_move) && result.can_fire });
diff --git a/src/core/actions/BaseAction.spec.ts b/src/core/actions/BaseAction.spec.ts
index e6dc0b0..d0054ab 100644
--- a/src/core/actions/BaseAction.spec.ts
+++ b/src/core/actions/BaseAction.spec.ts
@@ -39,9 +39,9 @@ module TK.SpaceTac.Specs {
                 ]);
         })
 
-        test.case("checks against remaining AP", check => {
+        test.case("checks against remaining power", check => {
             let action = new BaseAction("test");
-            check.patch(action, "getActionPointsUsage", () => 3);
+            check.patch(action, "getPowerUsage", () => 3);
 
             let ship = new Ship();
             check.equals(action.checkCannotBeApplied(ship), "action not available");
diff --git a/src/core/actions/BaseAction.ts b/src/core/actions/BaseAction.ts
index 54cf2a6..53918c3 100644
--- a/src/core/actions/BaseAction.ts
+++ b/src/core/actions/BaseAction.ts
@@ -105,7 +105,7 @@ module TK.SpaceTac {
             if (remaining_ap === null) {
                 remaining_ap = ship.getValue("power");
             }
-            var ap_usage = this.getActionPointsUsage(ship, null);
+            var ap_usage = this.getPowerUsage(ship, null);
             if (remaining_ap < ap_usage) {
                 return "not enough power";
             }
@@ -119,11 +119,11 @@ module TK.SpaceTac {
         }
 
         /**
-         * Get the number of action points the action applied to a target would use
+         * Get the power usage, for applying this action on an hypothetical target
          * 
          * If target is null, an estimated cost is returned.
          */
-        getActionPointsUsage(ship: Ship, target: Target | null): number {
+        getPowerUsage(ship: Ship, target: Target | null): number {
             return 0;
         }
 
@@ -196,7 +196,7 @@ module TK.SpaceTac {
             result.push(new ShipActionUsedDiff(ship, this, target));
 
             // Power usage
-            let cost = this.getActionPointsUsage(ship, target);
+            let cost = this.getPowerUsage(ship, target);
             if (cost) {
                 result = result.concat(ship.getValueDiffs("power", -cost, true));
             }
@@ -232,7 +232,7 @@ module TK.SpaceTac {
                 return false;
             }
 
-            let cost = this.getActionPointsUsage(ship, checked_target);
+            let cost = this.getPowerUsage(ship, checked_target);
             if (ship.getValue("power") < cost) {
                 console.warn("Action rejected - not enough power", ship, this, checked_target);
                 return false;
diff --git a/src/core/actions/EndTurnAction.ts b/src/core/actions/EndTurnAction.ts
index ac29b3f..2378aa9 100644
--- a/src/core/actions/EndTurnAction.ts
+++ b/src/core/actions/EndTurnAction.ts
@@ -22,7 +22,7 @@ module TK.SpaceTac {
             return this.name;
         }
 
-        getActionPointsUsage(ship: Ship, target: Target | null): number {
+        getPowerUsage(ship: Ship, target: Target | null): number {
             let toggled_cost = isum(imap(ship.iToggleActions(true), action => action.power));
             return ship.getValue("power") + toggled_cost - ship.getAttribute("power_capacity");
         }
diff --git a/src/core/actions/MoveAction.spec.ts b/src/core/actions/MoveAction.spec.ts
index 681ff45..6538851 100644
--- a/src/core/actions/MoveAction.spec.ts
+++ b/src/core/actions/MoveAction.spec.ts
@@ -10,7 +10,7 @@ module TK.SpaceTac.Specs {
             var action = new MoveAction("Engine", { distance_per_power: 10 });
             ship.actions.addCustom(action);
 
-            check.equals(action.getDistanceByActionPoint(ship), 10);
+            check.equals(action.getDistanceByPower(ship), 10);
 
             var result = action.checkTarget(ship, Target.newFromLocation(0, 20));
             check.equals(result, Target.newFromLocation(0, 20));
@@ -125,19 +125,19 @@ module TK.SpaceTac.Specs {
 
             let action = new MoveAction("Engine", { distance_per_power: 100, maneuvrability_factor: 60 });
             TestTools.setAttribute(ship, "maneuvrability", 0);
-            check.nears(action.getDistanceByActionPoint(ship), 40);
+            check.nears(action.getDistanceByPower(ship), 40);
             TestTools.setAttribute(ship, "maneuvrability", 1);
-            check.nears(action.getDistanceByActionPoint(ship), 60);
+            check.nears(action.getDistanceByPower(ship), 60);
             TestTools.setAttribute(ship, "maneuvrability", 2);
-            check.nears(action.getDistanceByActionPoint(ship), 70);
+            check.nears(action.getDistanceByPower(ship), 70);
             TestTools.setAttribute(ship, "maneuvrability", 10);
-            check.nears(action.getDistanceByActionPoint(ship), 90);
+            check.nears(action.getDistanceByPower(ship), 90);
 
             action = new MoveAction("Engine", { distance_per_power: 100, maneuvrability_factor: 0 });
             TestTools.setAttribute(ship, "maneuvrability", 0);
-            check.nears(action.getDistanceByActionPoint(ship), 100);
+            check.nears(action.getDistanceByPower(ship), 100);
             TestTools.setAttribute(ship, "maneuvrability", 10);
-            check.nears(action.getDistanceByActionPoint(ship), 100);
+            check.nears(action.getDistanceByPower(ship), 100);
         });
 
         test.case("builds a textual description", check => {
diff --git a/src/core/actions/MoveAction.ts b/src/core/actions/MoveAction.ts
index 3d10618..c183de3 100644
--- a/src/core/actions/MoveAction.ts
+++ b/src/core/actions/MoveAction.ts
@@ -67,10 +67,10 @@ module TK.SpaceTac {
             }
         }
 
-        getActionPointsUsage(ship: Ship, target: Target | null): number {
+        getPowerUsage(ship: Ship, target: Target | null): number {
             if (target) {
                 let distance = Target.newFromShip(ship).getDistanceTo(target);
-                return Math.ceil(distance / this.getDistanceByActionPoint(ship));
+                return Math.ceil(distance / this.getDistanceByPower(ship));
             } else {
                 return 0;
             }
@@ -84,26 +84,26 @@ module TK.SpaceTac {
          * Get the distance reachable with a given power 
          */
         getRangeRadiusForPower(ship: Ship, power = ship.getValue("power")): number {
-            return power * this.getDistanceByActionPoint(ship);
+            return power * this.getDistanceByPower(ship);
         }
 
         /**
-         * Get the distance range that may be traveled with 1 action point
+         * Get the distance range that may be traveled with 1 power point
          * 
          * The actual range will then depend on the ship maneuvrability
          */
-        getDistanceRangeByActionPoint(): IntegerRange {
+        getDistanceRangeByPower(): IntegerRange {
             let min_distance = Math.ceil(this.distance_per_power * (1 - this.maneuvrability_factor * 0.01));
             return new IntegerRange(min_distance, this.distance_per_power);
         }
 
         /**
-         * Get the distance that may be traveled with 1 action point
+         * Get the distance that may be traveled with 1 power point
          */
-        getDistanceByActionPoint(ship: Ship): number {
+        getDistanceByPower(ship: Ship): number {
             let maneuvrability = Math.max(ship.getAttribute("maneuvrability"), 0);
             let factor = maneuvrability / (maneuvrability + 2);
-            let range = this.getDistanceRangeByActionPoint();
+            let range = this.getDistanceRangeByPower();
             return range.getProportional(factor);
         }
 
@@ -147,7 +147,7 @@ module TK.SpaceTac {
         }
 
         getEffectsDescription(): string {
-            let range = this.getDistanceRangeByActionPoint();
+            let range = this.getDistanceRangeByPower();
             let rangeinfo = (range.max == range.min) ? `${range.min}` : `${range.min}-${range.max}`;
             let result = `Move: ${rangeinfo}km per power point`;
 
diff --git a/src/core/actions/ToggleAction.ts b/src/core/actions/ToggleAction.ts
index ff35dfc..60259e2 100644
--- a/src/core/actions/ToggleAction.ts
+++ b/src/core/actions/ToggleAction.ts
@@ -50,7 +50,7 @@ module TK.SpaceTac {
             }
         }
 
-        getActionPointsUsage(ship: Ship, target: Target | null): number {
+        getPowerUsage(ship: Ship, target: Target | null): number {
             return ship.actions.isToggled(this) ? -this.power : this.power;
         }
 
diff --git a/src/core/actions/TriggerAction.ts b/src/core/actions/TriggerAction.ts
index a18fd17..0bd5b72 100644
--- a/src/core/actions/TriggerAction.ts
+++ b/src/core/actions/TriggerAction.ts
@@ -91,7 +91,7 @@ module TK.SpaceTac {
             }
         }
 
-        getActionPointsUsage(ship: Ship, target: Target | null): number {
+        getPowerUsage(ship: Ship, target: Target | null): number {
             return this.power;
         }
 
diff --git a/src/ui/battle/ActionIcon.spec.ts b/src/ui/battle/ActionIcon.spec.ts
index 03617ce..4738994 100644
--- a/src/ui/battle/ActionIcon.spec.ts
+++ b/src/ui/battle/ActionIcon.spec.ts
@@ -15,7 +15,7 @@ module TK.SpaceTac.UI.Specs {
             check.same(icon.img_power.visible, false, "no change");
 
             let cost = 3;
-            check.patch(action, "getActionPointsUsage", () => cost);
+            check.patch(action, "getPowerUsage", () => cost);
             icon.refresh();
             check.in("power cost = 3", check => {
                 check.equals(icon.img_power.visible, true);
diff --git a/src/ui/battle/ActionIcon.ts b/src/ui/battle/ActionIcon.ts
index b2fddde..5029b4c 100644
--- a/src/ui/battle/ActionIcon.ts
+++ b/src/ui/battle/ActionIcon.ts
@@ -225,7 +225,7 @@ module TK.SpaceTac.UI {
             }
 
             // left
-            let cost = this.action.getActionPointsUsage(this.ship, null);
+            let cost = this.action.getPowerUsage(this.ship, null);
             this.img_power.visible = bool(cost);
             this.text_power.text = `${Math.abs(cost)}\n${cost < 0 ? "+" : "-"}`;
             this.text_power.fill = (cost > 0) ? "#ffdd4b" : "#dbe748";
diff --git a/src/ui/battle/ActionTooltip.ts b/src/ui/battle/ActionTooltip.ts
index f888698..dbac640 100644
--- a/src/ui/battle/ActionTooltip.ts
+++ b/src/ui/battle/ActionTooltip.ts
@@ -19,10 +19,10 @@ module TK.SpaceTac.UI {
                 if (ship.getValue("power") == 0) {
                     cost = "Not enough power";
                 } else {
-                    cost = `Cost: 1 power per ${action.getDistanceByActionPoint(ship)}km`;
+                    cost = `Cost: 1 power per ${action.getDistanceByPower(ship)}km`;
                 }
             } else {
-                let power_usage = action.getActionPointsUsage(ship, null);
+                let power_usage = action.getPowerUsage(ship, null);
                 if (power_usage) {
                     if (ship.getValue("power") < power_usage) {
                         cost = "Not enough power";
diff --git a/src/ui/battle/Targetting.ts b/src/ui/battle/Targetting.ts
index d487021..22e3aa2 100644
--- a/src/ui/battle/Targetting.ts
+++ b/src/ui/battle/Targetting.ts
@@ -112,7 +112,7 @@ module TK.SpaceTac.UI {
             let move = part.action instanceof MoveAction;
             let color = (enabled && part.possible) ? (move ? 0xe09c47 : 0xdc6441) : 0x8e8e8e;
             let src = previous ? previous.target : this.ship.location;
-            let gradation = (part.action instanceof MoveAction) ? part.action.getDistanceByActionPoint(this.ship) : 0;
+            let gradation = (part.action instanceof MoveAction) ? part.action.getDistanceByPower(this.ship) : 0;
             this.drawVector(color, src.x, src.y, part.target.x, part.target.y, gradation);
         }
 
@@ -265,7 +265,7 @@ module TK.SpaceTac.UI {
                     if (move_action) {
                         let power = this.ship.getValue("power");
                         if (this.action !== move_action) {
-                            power = Math.max(power - this.action.getActionPointsUsage(this.ship, this.target), 0);
+                            power = Math.max(power - this.action.getPowerUsage(this.ship, this.target), 0);
                         }
                         let radius = move_action.getRangeRadiusForPower(this.ship, power);
                         this.range_hint.update(this.ship, move_action, radius);