OkMap is a program which helps you calibrate your own maps for usage with GPS devices. It’s a free tool and rather easy-to-use.
OkMap was designed primarily for people who enjoy outdoor activities and own a GPS device. It’s perfect for cycling, hiking, sailing and other sports involving the wild outdoors. The usage of OkMap is pretty simple due to the program’s intuitive user interface. If it becomes too complicated, the developer offers a pretty good online help system to guide you through the process.
The menu system of the program is extensive and provides a way to calibrate digital maps while supporting raster and vector map images. You can enter different types of data such as way-points, routes, trails. Once done, the custom maps can be saved to many popular GPS formats.
One cool thing about OkMap is its integration with Google Maps and Google Earth.