I received notification today from Plimus that they had debitted my credit card for the subscription renewal for the Real-Time network. I have emailed to point out to Airnav Systems that I had taken advantage of their special offer in September & had already renewed.
There is obviously no double check of subscription status before these renewal payments are taken off, so beware, Plimus will take the payment when they think it is due.
I fully expect Airnav to refund the costs involved, but it does not reflect well on their system of checking.