Just to follow up on this one - I’ve been using a range of sources (Wikiloc, Google, paper maps, scenic) to plot off road routes around the alps.
And then running MyRoute on the tab nav and recording routes in scenic in the phone.
Day one it wasn’t working very well - quite laggy and slow. Then I realised I wasn’t in “offline” mode - as soon as I switched to that all worked well. And I like having the opportunity to switch the tab to Waze, Google or Netflix, as required.
And it hasn’t jumped out of the Ram tab holder either, which is nice.