For the NAV EU, you need to clip the VSS wire which is the Violet wire. This will give you two wire ends. Now run enough two-conductor wire that will reach somewhere in the passenger compartment. Then tie/connect each of two ends of the cut VSS wire to sperate ends of the wire you ran to the passenger compartment and connect up to the switch. So now when the switch is closed, Nav system works as normal. When the switch is in the open position. You can input your destination then afterwards close the switch when done to return normal NAV operation.
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