The software to upgrade units are posted on our website of the product in question. If you are inside Furuno USA's sales and support area and need more direct technical support please give tech support a call at 410-479-4420 or 360-834-9300. You can also get direct support via e-mail using our website (http://www.FurunoUSA.com) under Support - Ask a Question. If you are outside the Furuno USA area, please contact your local distributor for support.