Omnistar is activated for the lightbar. Once you activate and have the proper antenna, all you need to do is call and have your credit card handy so you can buy another subscription when the old one expires.
I have one 500 lightbar that's unlocked to Omni. In the spring & summer, that lightbar runs the autopilot in my tractor. In the fall, it gets moved to the combine and hooked up to the EZ-Steer. Since I've paid for a 1 year subscription in the spring, they don't need to be notified what the lightbar is controlling.