How do enthusiasts track the planes over the ocean? I saw a plane on flightradar24 that looked like it was 360mi+ away from the coast. (It was yellow, meaning ADS-B data.)
My guess is that planes reach their cruise heading, altitude and speed by the time they get out of range of ADS-B receivers. Since they follow predefined air corridors, location can be easily inferred from last known information. Obviously it won't be accurate if the plane has changed course to avoid bad weather (see: https://en.wikipedia.org/wiki/Air_France_Flight_447).
