Convert Web (Google,Yahoog,Bing,Cloudemat,Openstreet) map to Garmin Custom Map. Create/Edit waypoints Overlay two different maps for study.

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex, Mapy.cz in Windows Forms & Presentation, supports caching and runs on windows mobile!