i'm going to donate to this , it's very very great
and i'm waiting for an update soon
And I would recommend adding two buttons to the mainscreen when the zoom-in, zoom-out and menu buttons become available by clicking the screen: - Toggle map overlay on/off, I do this quite often, sometimes it's useable to view the sat nav over the map, sometimes not. - Sound on/off, this is also useful while navigating sometimes.
I have two additional recommendations, it'd be useful to show current travelling speed. And then, alongside the remaining km to next turn, and total remaining km, also the estimated time to next turn, and total remaining estimated time.
I think I've come up with the reason the font is messed up, sometimes supersmall in the directions. You said, the size is determined automatically, so that the instructions fit in the box, right? Well this is it, sometimes the directions are super long, and they seem to be fitted on only one line, and then when super small split...
I think this is a wrong approach, the font should always stay the same, the instructions should have line folding, and then after a couple of lines, if they don't fit in the box, well too bad, they should just be cut...