The TeleType GPS Software Developer's Kit (SDK) contains .dlls, sample program with source code. Requires TeleType GPS software. Please note that this SDK does not allow you to create your own program using our engine. The intent of the SDK is to allow you to access TeleType GPS menus. GPS data can be accessed free of charge using the RMClog.txt file. Support for this product is charged at the rate of $180/hour. Contact custom@teletype.com for quotation of costs associated with with implementing your project using our code, including pre-sales questions.

Documentation for TeleType GPS SDK Part #3098, WinCE, Win32, PocketPC: 
TeleType GPS Software Development Kit (SDK) part number 3098.
Purchase SDK here.