Perspective works in V27.1 without any patching, but it is disabled by default.

Go to the Setting menu, then press and hold the menu button. After about 10 seconds you should get to the Nav configuration menu. Scroll down to the bottom, the Perspective option is just off the bottom of the screen, and change it from No to Yes. Press menu again to get back to the normal operating mode. Now you should have a third option when you select the map direction.