The Microsoft GPS-360 SiRF USB Receiver Unit is an external attachment specifically designed for use with Microsoft Maps. This GPS receiver unit, model GPS-500, connects to a computer via USB and allows for accurate location tracking and navigation within the Microsoft Maps application. Made by Microsoft, this unit is compatible with USB connectivity and is an essential accessory for enhancing the functionality of Microsoft's mapping software. Designed for ease of use and compatibility with various devices, this GPS receiver unit is a convenient and reliable tool for improving the gaming experience.