Check the system you have by going Jaguar in control Subscription
Depending on the year you need to updated via USB then you need to go to https://www.jaguar.here.com/index.php
Your log in information will be what the car system has been set up - if in doubt please speak to your dealer to ensure that the car has been reset to your account and activated correctly. Once your account is active then you can sign in on the car and in this site and then download the latest map - this is locked to the VIN of the car. Your subscription to Here.com will determine the map you need to buy - the system allows a 1 year or longer 3 year subscription. The maps are updated every month.