You’ve assumed correctly. Just seen this which is applicable to InControl Touch Pro....https://www.jaguar.co.uk/ownership/infotainment-systems/infotainment/map-updates/index.html
"Map Care is included within our standard three-year manufacturer's warranty for our Touch Pro systems, providing you with free map updates that are available to download for the duration of the warranty period.
HOW TO UPDATE
To update your map, first set up an account using the link provided. When logged in go to ‘Maps & Services’, download the relevant map and transfer it to your vehicle via a USB device. It is recommended that downloads are done to a standard USB device, such as a memory stick (USB 3.0 is best) with 64GB of free storage space."
Also this...https://www.jaguar.co.uk/ownership/infotainment-systems/touch-faqs.html#navigation
"How do I transfer my downloaded map data from a USB device to my vehicle?
Step 1.
Start the engine of your vehicle and ensure the navigation system is switched on. Note: The engine must be running during the entire map update process to ensure that the vehicle’s power-saving measures do not interrupt the update. Remain stationary. Note: You may start driving after the update process has begun, but the navigation system cannot be used for routing until the map update is complete.
Step 2.
Locate the USB slot on the vehicle, this is typically located in the centre stowage area between the front seats. Insert the USB stick containing the downloaded map data into the slot. Follow the onscreen instructions to complete the map installation.
Step 3.
Once the update is complete, remove the USB stick and click Continue. The navigation system will automatically shut down and restart. Click Continue to return to the home screen. Your new map is now available to use."