Ozi-Explorer is a professional but more expensive (c.a. $65) resource allowing management of waypoints, routes and trackpoints against a digital map background. As its shareware there is also a limited free trial version. www.oziexplorer.com
Mag-Way; a good basic free waypoint editor for Magellan GPS units, with the advantage of being able to convert travel information into routes / waypoints with a little bit of extra free software.
Visual Basic Macro Code for converting Ordanance Survey OSGB grid references to OSGB36 latitude / longitude in MS Office 2000 software. (Note the majority of applications use the WGS84 datum – so you might find Phil Brady’s Excel Spreadsheet… more useful.) Excel Conversion Spreadsheet (MS Excel 2000) for converting OS grid references to latitude / longitude » read more »