I wonder if someone can help me, please. I think it might be user error but I cannot see where I have made a mistake.
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I have downloaded the full sets of UK and French maps to my iPhone.
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I have downloaded a day out route in France to my iPhone.
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In Navigation settings > Functional > Offline navigation is active (green).
I am at home in the UK.
If I switch my phone to airplane mode, logically it replicates being offline.
In airplane mode I can display the day out route in France.

If I then touch Navigate, I assume (which is maybe where I am going wrong) that the app will calculate me a route from my home in the UK to the start of the route in France. But it will not do it. Instead, I get a message which shows:

Surely, if I have downloaded the full set of UK and French maps, the app should, I assume, be able to calculate an route to join me in the UK to the start of the route in France?
If though I switch out of aeroplane mode (go online) the app will calculate me a perfect route from home to the start of the route in France and navigate me around it.

What am I doing wrong and / or what have I misunderstood?
Thank you.
Richard
PS Is my mistake at point 3 above, where I say:
3. In Navigation settings > Functional > Offline navigation is active (green).
Should I turn this to off (red)?
If so, that means that you need to be online in order to commence any navigation and then switch to offline mode? If so, surely that defeats a part of the purpose of the app’s offline capabilities?