EasyGPS to Mapsource Waypoint Conversion. LOC2WPT allows you to convert the waypoint file directly to a Garmin Mapsource or Google Earth file.

You can also convert the Speed Camera Database (CSV format found at www.PocketGPSWorld.co.uk).
You can create your own data using CSV file. (See below for format)
You can also convert NetStumbler data. (In NetStumbler, go to 'File', 'Export', and choose 'Text...'. It will save as a .txt file.)

The license of this software is Freeware, you can free download and free use this file converter software.