Question: Changing the Coordinate System

I realize that it would be fairly straight forward for me to perform the necessary conversions on the raw data set elements to achieve the same result, but it would be helpful I think if I were able to load the transform into the plot command as I go, basically I want to implement the ability to make additions to the list that is on the coords help page, give the entry a name that plot()  will remember, because I will have commentary data on why I was looking at the plot, what ideas it was relevant to, references etc  and date of entry  etc etc that will also be associated with that name.

Essentially a hint as to where I should start is what I need 

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