1 files changed, 11 insertions, 2 deletions
diff --git a/web/app/store/SpeedUnits.js b/web/app/store/SpeedUnits.js
index e29a42c7..a14ab22d 100644
--- a/web/app/store/SpeedUnits.js
+++ b/web/app/store/SpeedUnits.js
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Anton Tananaev (anton@traccar.org)
+ * Copyright 2015 - 2016 Anton Tananaev (anton@traccar.org)
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -33,12 +33,21 @@ Ext.define('Traccar.store.SpeedUnits', {
         factor: 1.15078
     }],
 
+    convertValue: function (value, unit) {
+        var model;
+        if (!unit) {
+            unit = 'kn';
+        }
+        model = this.findRecord('key', unit);
+        return value * model.get('factor');
+    },
+
     formatValue: function (value, unit) {
         var model;
         if (!unit) {
             unit = 'kn';
         }
         model = this.findRecord('key', unit);
-        return (value * model.get('factor')).toFixed(1) + ' ' + model.get('name');
+        return this.convertValue(value, unit).toFixed(1) + ' ' + model.get('name');
     }
 });