diff --git a/.jshintignore b/.jshintignore
new file mode 100644
index 00000000..4b71d483
--- /dev/null
+++ b/.jshintignore
@@ -0,0 +1 @@
+app/js/db.js
\ No newline at end of file
diff --git a/app/js/app.js b/app/js/app.js
index 5cfdeedf..a57c80d8 100644
--- a/app/js/app.js
+++ b/app/js/app.js
@@ -1,9 +1,9 @@
 angular.module('app', ['ngRoute','shipyard','ngLodash','app.templates'])
-.config(['$routeProvider', '$locationProvider', function($routeProvider, $locationProvider) {
+.config(['$routeProvider', function($routeProvider) {
   //$locationProvider.html5Mode(true);
   $routeProvider
     .when('/:ship', { templateUrl: 'views/ship.html', controller: 'ShipController' })
-    .when('/', { templateUrl: 'views/ships.html', controller: 'ShipyardController' })
+    .when('/', { templateUrl: 'views/ships.html', controller: 'ShipyardController' });
 
 }])
 .run(['$rootScope','commonArray','shipPurpose', 'shipSize', 'hardPointClass', 'internalGroupMap', function ($rootScope, CArr, shipPurpose, sz, hpc, igMap) {
@@ -23,7 +23,7 @@ angular.module('app', ['ngRoute','shipyard','ngLodash','app.templates'])
   $rootScope.fPct = d3.format(',.2%');
 
   $rootScope.calcJumpRange = function(mass, fsd, fuel) {
-    return Math.pow( (fuel || fsd.maxfuel) / fds.fuelmul, 1 / fsd.fuelpower ) * fsd.optmass / mass;
+    return Math.pow( (fuel || fsd.maxfuel) / fsd.fuelmul, 1 / fsd.fuelpower ) * fsd.optmass / mass;
   };
 
   // TODO: Load Saved Ships List from Local Storage
diff --git a/app/js/controllers/controller-ship.js b/app/js/controllers/controller-ship.js
index 352b4df6..e7055bb5 100644
--- a/app/js/controllers/controller-ship.js
+++ b/app/js/controllers/controller-ship.js
@@ -5,6 +5,6 @@ angular.module('app')
   $scope.availCS = Components.forShip($scope.shipId);
 
   // for debugging
-  window.ship = $scope.ship;
-  window.availcs = $scope.availCS;
+  //window.ship = $scope.ship;
+  //window.availcs = $scope.availCS;
 }]);
\ No newline at end of file
diff --git a/app/js/controllers/controller-shipyard.js b/app/js/controllers/controller-shipyard.js
index 056015ab..c07e3bcf 100644
--- a/app/js/controllers/controller-shipyard.js
+++ b/app/js/controllers/controller-shipyard.js
@@ -1,4 +1,4 @@
 angular.module('app')
-.controller('ShipyardController', ['$rootScope', '$scope', function ($rootScope, $scope) {
+.controller('ShipyardController', function () {
 
-}]);
\ No newline at end of file
+});
\ No newline at end of file
diff --git a/app/js/directives/directive-list-cost.js b/app/js/directives/directive-list-cost.js
index 769e8b60..e2c23ae2 100644
--- a/app/js/directives/directive-list-cost.js
+++ b/app/js/directives/directive-list-cost.js
@@ -1,14 +1,11 @@
-angular.module('app').directive('costList', ['$rootScope', 'lodash', function ($r, _) {
+angular.module('app').directive('costList', ['$rootScope', function ($r) {
   return {
     restrict: 'A',
     scope: {
       ship: '='
     },
     templateUrl: 'views/costs.html',
-    link: function (scope, element, attributes) {
-      scope.hps = ship.hardpoints;
-      scope.ints = ship.internal;
-      scope.com = ship.common;
+    link: function (scope) {
       scope.$r = $r;
       scope.insuranceOptions = {
         Alpha: 0.975,
@@ -20,7 +17,7 @@ angular.module('app').directive('costList', ['$rootScope', 'lodash', function ($
       scope.toggle = function(item) {
         item.incCost = !item.incCost;
         scope.ship.updateTotals();
-      }
+      };
     }
   };
 }]);
\ No newline at end of file
diff --git a/app/js/directives/directive-list-power.js b/app/js/directives/directive-list-power.js
index 5d187f27..00721158 100644
--- a/app/js/directives/directive-list-power.js
+++ b/app/js/directives/directive-list-power.js
@@ -1,18 +1,18 @@
 angular.module('app')
-  .directive('powerList', ['$rootScope', 'lodash', function ($r, _) {
+  .directive('powerList', ['$rootScope', function ($r) {
     return {
       restrict: 'A',
       scope: {
         ship: '=ship'
       },
       templateUrl: 'views/power.html',
-      link: function (scope, element, attributes) {
+      link: function (scope) {
         scope.$r = $r;
 
         scope.toggle = function(slot) {
           slot.enabled = !slot.enabled;
           scope.ship.updateTotals();
-        }
+        };
       }
     };
   }]);
\ No newline at end of file
diff --git a/app/js/directives/directive-menu.js b/app/js/directives/directive-menu.js
index b75a4a81..808c63cb 100644
--- a/app/js/directives/directive-menu.js
+++ b/app/js/directives/directive-menu.js
@@ -1,13 +1,13 @@
-angular.module('app').directive('shipyardMenu', ['$rootScope', 'lodash', function ($rootScope, _) {
+angular.module('app').directive('shipyardMenu', function () {
 
   return {
     restrict: 'E',
     templateUrl: 'views/menu.html',
-    link: function (scope, element, attributes) {
+    link: function () {
 
       // TODO: Saved Ships: load, save, save as, delete, export
       // TODO: Links: github, forum, etc
 
     }
   };
-}]);
\ No newline at end of file
+});
\ No newline at end of file
diff --git a/app/js/shipyard/factory-ship.js b/app/js/shipyard/factory-ship.js
index fdb700f1..4c698d82 100644
--- a/app/js/shipyard/factory-ship.js
+++ b/app/js/shipyard/factory-ship.js
@@ -10,7 +10,8 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
     this.id = id;
     this.defaults = shipData.defaultComponents;
     this.incCost = true;
-    this.cargoScoop = { enabled: true, c: { name: 'Cargo Scoop', class: 1, rating: 'H', power: .6} };
+    this.cargoScoop = { enabled: true, c: { name: 'Cargo Scoop', class: 1, rating: 'H', power: 0.6} };
+    this.sgSI = null; // Shield Generator Slot Index
 
     angular.forEach(shipData,function(o,k){
       if(typeof o != 'object') {
@@ -25,7 +26,7 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
               maxClass: arr[i]
             });
           }
-        }.bind(this))
+        }.bind(this));
       }
     }.bind(this));
   }
@@ -55,29 +56,30 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
     var availCommon = DB.components.common;
     var availHardPoints = DB.components.hardpoints;
     var availInternal = DB.components.internal;
+    var i,l;
 
     this.bulkheads = { incCost: true, id: comps.bulkheads || 0, c: DB.components.bulkheads[this.id][comps.bulkheads || 0] };
 
-    for(var i = 0, l = comps.common.length; i < l; i++) {
+    for(i = 0, l = comps.common.length; i < l; i++) {
       common[i].id = comps.common[i];
       common[i].c = availCommon[i][comps.common[i]];
     }
 
-    for(var i = 0, l = comps.hardpoints.length; i < l; i++) {
+    for(i = 0, l = comps.hardpoints.length; i < l; i++) {
       if(comps.hardpoints[i] !== 0) {
         hps[i].id = comps.hardpoints[i];
         hps[i].c = availHardPoints[comps.hardpoints[i]];
       }
     }
 
-    for(var i = 0, l = comps.internal.length; i < l; i++) {
+    for(i = 0, l = comps.internal.length; i < l; i++) {
       if(comps.internal[i] !== 0) {
         internal[i].id = comps.internal[i];
         internal[i].c = availInternal[comps.internal[i]];
       }
     }
     this.updateTotals();
-  }
+  };
 
   /**
    * Serializes the selected components for all slots to a URL friendly string.
@@ -103,7 +105,7 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
    * @return {string}      The id of the selected component or '-' if none selected
    */
   function idToStr(slot) {
-    return o.id === undefined? '-' : o.id;
+    return slot.id === undefined? '-' : slot.id;
   }
 
   /**
@@ -128,9 +130,9 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
         if (c < commonCount) {
           comps.common[c] = code.substring(i, i + 2);
         } else if (c < hpCount) {
-          comps.hardpoints[c - commonCount] = code.substring(i, i + 2)
+          comps.hardpoints[c - commonCount] = code.substring(i, i + 2);
         } else {
-          comps.internal[c - hpCount] = code.substring(i, i + 2)
+          comps.internal[c - hpCount] = code.substring(i, i + 2);
         }
         i++;
       }
@@ -138,7 +140,7 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
     }
 
     this.defaults = comps;
-    this.buildWidth(data);
+    this.buildWidth(comps);
   };
 
   /**
@@ -159,32 +161,37 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
     this.powerDeployed = this.powerRetracted + h.power;
 
     // TODO: range
+    this.calcShieldStrength = this.sgSI !== null? calcShieldStrength(this.mass, this.shields, this.internal[this.sgSI], 1) : 0;
     this.armourAdded = 0; // internal.armoradd TODO: Armour (reinforcement, bulkheads)
     this.armorTotal = this.armourAdded + this.armour;
-
-  }
+  };
 
   /**
    * Update a slot with a the component if the id is different from the current id for this slot.
    * Frees the slot of the current component if the id matches the current id for the slot.
    *
-   * @param {object} slot          The component slot
-   * @param {string} id            Unique ID for the selected component
-   * @param {object} componentData Properties for the selected component
+   * @param {object} slot      The component slot
+   * @param {string} id        Unique ID for the selected component
+   * @param {object} component Properties for the selected component
    */
-  Ship.prototype.use = function(slot, id, componentData) {
-    if (slot.id != id) { // Selecting a different option
+  Ship.prototype.use = function(slot, id, component) {
+    if (slot.id != id) { // Selecting a different component
       slot.id = id;
-      slot.c = componentData;
+      slot.c = component;
 
-      // New componnent is a Shield Generator
-      if(componentData.group == 'sg') {
+      // Selected componnent is a Shield Generator
+      if(component.group == 'sg') {
+        var slotIndex = this.internal.indexOf(slot);
         // You can only have one shield Generator
-        // TODO: find shield generator that is not this one
-        // set c.id = null, c.c = null;
+        if (this.sgSI !== null && this.sgSI != slotIndex) {
+          // A shield generator is already selected in a different slot
+          this.internal[this.sgSI].id = null;
+          this.internal[this.sgSI].c = null;
+        }
+        this.sgSI = slotIndex;
       }
-    // Deselecting current option
     } else {
+      // Deselect current component
       slot.id = null;
       slot.c = null;
     }
@@ -212,7 +219,7 @@ angular.module('shipyard').factory('ShipFactory', ['components', 'lodash', funct
       return shields * multiplier * (sg.optmul + (mass - sg.optmass) / (sg.maxmass - sg.optmass) * (sg.maxmul - sg.optmul));
     }
     return shields * multiplier * sg.maxmul;
-  };
+  }
 
   /**
    * Utilify function for summing the components properties
diff --git a/app/js/shipyard/module-shipyard.js b/app/js/shipyard/module-shipyard.js
index add3d626..877de58c 100644
--- a/app/js/shipyard/module-shipyard.js
+++ b/app/js/shipyard/module-shipyard.js
@@ -69,8 +69,6 @@ angular.module('shipyard', [])
         case 'u':
           l.push('Utility');
           break;
-        default:
-          console.error('Invalid group size', grp);
       }
       switch(a[1]) {
         case 'o':
@@ -91,8 +89,6 @@ angular.module('shipyard', [])
         case 'm':
           l.push('Mount');
           break;
-        default:
-          console.error('Invalid group category', grp);
       }
       return l.join(' ');
     }
diff --git a/gulpfile.js b/gulpfile.js
index 4ccdf3ee..bf6f85dc 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -23,7 +23,12 @@ gulp.task('less', function() {
 
 gulp.task('lint', function() {
   return gulp.src('app/js/**/*.js')
-    .pipe(jshint())
+    .pipe(jshint({
+      undef: true,
+      unused: true,
+      curly: true,
+      predef: [ "angular",'DB','d3' ]
+    }))
     .pipe(jshint.reporter('default'));
 });
 
@@ -121,6 +126,7 @@ gulp.task('watch', function() {
   gulp.watch('app/less/*.less', ['less']);
   gulp.watch('app/views/**/*', ['html2js']);
   gulp.watch('app/js/**/*.js', ['js']);
+  gulp.watch('data/**/*.json', ['jsonToDB']);
 });
 
 gulp.task('clean', function (done) { del(['build'], done); });