Update message: Topcat is not going to be updated with the PMDG 777-300ER! in PMDG 777 Posted November 19, 2015 michael whilst I'm sure most would not subscribe to navigraph for topcat airac updates alone .... but given a subscription provides you downloads for all your planes plus a few planners etc, updating topcat / pfpx also helps cover those many changes the freeware afcad community & orbx regions provide over time as well as matching the latest charts (eg KFLL / KORD recent changes) I subscribed to monthly, it's like 8 USD a month. I love it. Before I would update like once a year. Now, its cheaper than spotify.