When using Navigator to follow along your route, you have several ways to control your map view and orientation. By default, your current location will be centered on the map and North will always be up (↑ top of phone). You can adjust your orientation by tapping the red and grey compass icon — this will adjust your view so that your direction of travel stays up. When using this mode, you’ll notice that if you move your phone around the map will adjust directions to keep your direction of travel up. Tapping the compass icon once again will switch you back to the original mode of North being up.
You can always adjust your zoom level by using two fingers to pinch the screen. Once you have adjusted your zoom level or panned around the map, you’ll see a small white arrow appear at the bottom left of your map. Tapping this re-centre button will adjust your view so that your current location is back in the centre of the map. Using this button will still respect your map orientation (see above), and will maintain your zoom level.