Thanks Roger. I know the conversion itself is simple if you're sitting there doing it on a calculator. It becomes fairly complicated using C# code though which is why I was surprised there wasn't already a Math function for it. They have sin, cos and tan which all work in angles and in the real world - surveying, mapping, navigation, etc. - angles come in degrees, minutes and seconds. I will pass my method along once I have finished it in case anybody else wants it. Thanks for your feedback.