i-Boating supports using external GPS receivers (USB, Bluetooth, serial port etc) on both Windows and Macbook. It is important that you use the latest version. You can download the software directly from the links below: i-Boating software download Setting up GPS with i-Boating on Windows and Macbook If GPS isn't configured, the application will prompt you to configure it. You can configure it anytime using the steps below: Tap more button in the action bar on the bottom left Tap on Setting In Settings screen, tap on GPS Settings Select the device that matches your GPS. On Windows, its usually some COM port. On Mac you will see a different name. Tap Save