My Garmin adjusts the zoom level based on the vehicle speed. The slower I am travelling, the more it zooms in. When I speed up, it gradually zooms out for a wider view again.
Hmm. I think I prefer a mixture of that and the distance to the next directional change. Even if I'm on slower roads, I'd prefer to see far out in front of me if I don't have to worry about anything anytime soon. Likewise, if I'm at fast speeds on a highway and I need to get onto an exit at full speed, I want that to be zoomed in so I can see it carefully enough.
But I don't know, I haven't used the Garmin. I might prefer that method.
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