Cannot make Traveller work

Hi all, brand new member, also brand new at Traveller and Tracker, as we are about to use them on a trip. Left for our trip today.

So I did a test of traveller and tracker last week. Traveller worked, I could get a route and navigate to it. Tracker worked. But today I have spent the last 4 hours, on my lap in the car, trying to get traveller to navigate without success.

So I go to search, select Exploreoz and search Mildura. I get offered the option of “Show” or “Go to”. I tap go to and see a box on the right “Navigation” with a green “Begin Navigation” I hit begin navigation and nothing happens. I just see Mildura.

In the past I have seen a blue route, I do not see this at any stage now. As well as that in the Navigation box I see Mode – unavailable” That seems significant to me so I’ve looked all through settings to see if there is anything that could be blocking this but can’t see anything.

As well as that when I hit begin navigation and I see Mildura a blue box pops up on top saying ”Begin Navigation destination Mildura” but it disappears and tapping this does not begin navigation.

After 4 hours of trying, on my lap, including consulting the manual a few times to make this work I’m completely stumped and worried now that our navigation system isn’t working. I’ve put this here and sent it to support as I suspect support is closed on a Saturday and it will be Monday before anything happens, by which time we’ll be out of reception.

Any and all help gratefully received, thanks. Peter