How to route map between two distinct points? I feel that this must be a common and easy feature on the iPhone. I am looking for the ability to map between two distinct points on the iPhone by thumbtack.

I understand you can do it via explicit address, but this is not often at hand and this method runs against several use cases (e.g. Mapping run route).

How to do this?
Drop a pin and add the location to your bookmarks.
Drop another pin and tap the directions button.
Select the first location as the location in your bookmarks and the second location should already be set to the second dropped pin location.