TO FIND YOUR UPGRADE NUMBERS:
1. Open the AirNav Program on your computer.
2. In the toolbar at the top of the AirNav window click on SECURITY.
3. Open the UPGRADE WINDOW.
4. You will be able to see your Upgrade Numbers.

NOTE: The Upgrade Number will be different for each computer you have, so you will need to get the Upgrade Number for each computer you have AirNav installed on by following the above instructions.