It's a weather briefing system. I forget what it stands for, but it's an automated system accessed on the internet. You tell it where you'll be flying, and it gives you all the needed information.
I only use it for AOPA's Real Time Flight Planner. I don't really like it, because it gives you security package Romeo every time you ask for a briefing. I'd much rather talk to a real person, even though most of the Flight Service Stations are going away. I had a chance to talk to the station supervisor for Princeton at a safety meeting. He diffused a lot of my concerns about privatising and consolidating Flight Service.
Incidentally, if you're calling to file and get a weather briefing, get the briefing first. They only have like 5 seconds to start a briefing after you ask for it. And, how can you file if you don't know how long it'll take? Can't know that until you get the winds.
