Using Google maps as example, double-tapping screen with one finger zooms in automatically (as does Windy)... Unless you hold the second tap and drag, then zoom in and out occurs... Drag up for out and down for in. Can be much more handy than two-finger zooming if only one hand is free

Using Google maps as example, double-tapping screen with one finger zooms in automatically (as does Windy)... Unless you hold the second tap and drag, then zoom in and out occurs... Drag up for out and down for in. Can be much more handy than two-finger zooming if only one hand is free