I stumbled across a solution that works well for me. I have a '67 +4 with no phone mounting points installed, and blazing South Florida sunshine that makes the screen completely illegible with sunglasses on. What does work, however, is the nav handoff from the phone to my Apple watch. I get a little tickle on my wrist when a turn approaches, and I can easily angle my wrist to see the display. I don't run the risk of catching a truncheoning for touching a phone whilst driving, and I can tuck my phone safely in the glovebox, where it really does belong. Unlike my nearly 3-tonne boulevard battleship, the Moggie requires a little more presence of mind.
