proper/best type for storing latitude and longitude

Question

In a system level programming language like C, C++ or D, what is the best type/encoding for storing latitude and longitude?

The options I see are:

• IEEE

Answer 1

0.3 inch resolution is getting down to the point where earthquakes over a few years make a difference. You may want to reconsider why you believe you need such fine resolution worldwide.

Some of the spreading centres in the Pacific Ocean change by as much as 15 cm/year.