So to navigate you can use one finger and then on the display move around and that actually will rotate the camera.
With two fingers on the screen: swiping left and right, up and down will actually allow you to pan around.
And then with two fingers pinching: you can zoom in and zoom out.
So you see, there's actually a pretty nice navigation with one hand you can do all the navigations: rotate, pan and zoom and then with the other hand for the pencil you can do all the drawing.
And let's actually go back to top view and I just would like to show you how the grid display changes. You see the more I zoom in, the grid refines.
And also the grid display changes.