One thumb zoom with Google Maps

I use Google Maps (and Apple Maps) a lot when I’m walking around in an unfamiliar place. Instead of holding the phone in one hand and dragging and pinching-to-zoom with the other hand, I learned I can do everything with one hand. I hold the phone in my left hand and use my thumb to drag. And if I want to zoom in or out, I tap twice with my thumb, leaving my thumb on the display after the second tap, and then slide my thumb up or down to zoom. — MF