Dave Mark writing for The Loop:
I love this tip. Here’s how to do it:
– Bring up Apple Maps.
– Double-tap in the map, but on the second tap, don’t lift your finger. So tap-lift-tap-leave.
– Now [with the finger still down] slide up or down to zoom in and out.
As Dave notes Google Maps supports the same gesture. It actually has supported this for ages and I always found myself trying to do this in Apple Maps. With iOS 11 I was happy to find out it finally works the same. Well, I should rather say works similar, because the directions are flipped on Google Maps: move your finger up to zoom out and down to zoom in.