No, I'm not suggesting they were driving after the radio call. I think the clue to what happened might have something to do with where they were earlier in the day, and the day before. The timeline I've seen has them leaving home in the outskirts of Melbourne early on 19th March. The radio call from the Wonnangatta Station area was shortly before dusk on 20th March. We know they travelled through Heyfield and Licola, which is what you'd expect. But the journey from Carol's place at Pakenham (outer Melbourne) to Wonnangatta only takes about five hours. So I want to know where they spent the afternoon of 19th March, the night of 19th-20th March, and most of the day of 20th March. As Russell asked for directions to Dargo in the radio call, it's reasonable to think they hadn't spent the time at Dargo, although I was considering that possibility a few days ago. I think there's a good chance he was continuing on from what he was doing the week before, when he was exploring with his drone near the intersection of Bluff Track and King Billy Track. This fits with the police request to be contacted by anyone who was in the area of Mt Howitt/Howitt Plains on 19th or 20th March.