Like the HTC Mogul, the update adds Windows Mobile 6.1. However, the update also adds gpsOne support, including Sprint Navigation. After the update, you will be able to use GPS services in all supporting applications, such as Google Maps for Mobile and Windows Live Search for Mobile.
The update must be downloaded to a Windows PC, after which the on-screen instructions will guide you through the updating process. Sprint will be posting this upgrade on their servers in the next few days, but you can get it early be accessing our HTC Touch page on the Phone Encyclopedia.