Thanks everyone. This is very helpful and I think I am getting the hang of it. I have another one that is exactly the same but is for Bearing ("The direction of one object in relation to another object"). So that one would be Navigation.Bearing.Direction right?

Last question: I have another class, the same as above, which is called "Speed". It is used to hold meters per second. I am using it for this GPS app but I don't think it should go into the Navigation namespace as it could be related to stuff other than navigation, right? For the property name of this class, would I want to name it something like "MetersPerSecond" or is that a no no?

Stephen