Taken from another earlier post:-
If you have 4-1/70 or higher, you need to enable the Perspective feature by doing a one-time setting change in the nav computers service menu. Do this:
* Push the "MENU" button to get to the the main menu.
* Scroll to the "SETTINGS" menu selection and click the knob to select it.
* Push and hold the "MENU" button for about 8 seconds to enter the GPS Service Menu.
* Scroll beyond the bottom to a 2nd page, where you will get the Perspective option.
* Click the knob on the Perspective option to select it. - Now you will be able to select Perspective within the navigation map view.
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